CVE-2021-41819 (GCVE-0-2021-41819)
Vulnerability from cvelistv5 – Published: 2022-01-01 00:00 – Updated: 2025-05-22 15:00
VLAI
EPSS
VEX
Summary
CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-22 14:43 UTC
CWE
- n/a
- CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Assigner
References
6 references
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T03:22:24.942Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://hackerone.com/reports/910552"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"tags": [
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"name": "FEDORA-2022-82a9edac27",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"name": "FEDORA-2022-8cf0124add",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"name": "GLSA-202401-27",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202401-27"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-41819",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-22T14:43:38.811242Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-565",
"description": "CWE-565 Reliance on Cookies without Validation and Integrity Checking",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-05-22T15:00:52.998Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-01-24T05:06:40.201Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://hackerone.com/reports/910552"
},
{
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"name": "FEDORA-2022-82a9edac27",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"name": "FEDORA-2022-8cf0124add",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"name": "GLSA-202401-27",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202401-27"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2021-41819",
"datePublished": "2022-01-01T00:00:00.000Z",
"dateReserved": "2021-09-29T00:00:00.000Z",
"dateUpdated": "2025-05-22T15:00:52.998Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-41819",
"date": "2026-09-19",
"epss": "0.02931",
"percentile": "0.8647"
},
"fkie_nvd": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.1.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "2DEC113F-FF5D-48DC-896B-E1C8A2C76C9C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.2.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "59B7F28D-757D-429F-88B5-7A8DAFB9BB4C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.3.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "C8CB09D2-66DD-4E05-B9FC-F1C632C6942F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "64AC442C-39CB-477C-9356-F36AF6762E53",
"versionEndIncluding": "2.6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D7B53365-0B48-4408-A4A7-9A3744F89F07",
"versionEndExcluding": "2.7.5",
"versionStartIncluding": "2.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D4499575-33A0-47D7-A88B-0E6FD2340792",
"versionEndExcluding": "3.0.3",
"versionStartIncluding": "3.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:redhat:software_collections:-:*:*:*:*:*:*:*",
"matchCriteriaId": "749804DA-4B27-492A-9ABA-6BB562A6B3AC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
"matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
"matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
"matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:11.0:sp1:*:*:*:*:*:*",
"matchCriteriaId": "4500161F-13A0-4369-B93A-778B34E7F005",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:12.0:*:*:*:*:*:*:*",
"matchCriteriaId": "CBC8B78D-1131-4F21-919D-8AC79A410FB9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:15.0:*:*:*:*:*:*:*",
"matchCriteriaId": "1607628F-77A7-4C1F-98DF-0DC50AE8627D",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:opensuse:factory:-:*:*:*:*:*:*:*",
"matchCriteriaId": "E29492E1-43D8-43BF-94E3-26A762A66FAA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*",
"matchCriteriaId": "B009C22E-30A4-4288-BCF6-C3E81DEAF45A",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
"matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby."
},
{
"lang": "es",
"value": "CGI::Cookie.parse en Ruby versiones hasta 2.6.8, maneja inapropiadamente los prefijos de seguridad en los nombres de las cookies. Esto tambi\u00e9n afecta a CGI gem versiones hasta 0.3.0 para Ruby."
}
],
"id": "CVE-2021-41819",
"lastModified": "2024-11-21T06:26:48.883",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2022-01-01T06:15:07.293",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Permissions Required",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/910552"
},
{
"source": "cve@mitre.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"source": "cve@mitre.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"source": "cve@mitre.org",
"url": "https://security.gentoo.org/glsa/202401-27"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Permissions Required",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/910552"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://security.gentoo.org/glsa/202401-27"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-565"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"microsoft_vex": {
"current_release_date": "2022-01-13T00:00:00.000Z",
"cve": "CVE-2021-41819",
"id": "msrc_CVE-2021-41819",
"initial_release_date": "2022-01-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.",
"url": "https://msrc.microsoft.com/csaf/vex/2022/msrc_cve-2021-41819.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"source": "cve@mitre.org"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.1.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "2DEC113F-FF5D-48DC-896B-E1C8A2C76C9C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.2.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "59B7F28D-757D-429F-88B5-7A8DAFB9BB4C",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:cgi:0.3.0:*:*:*:*:ruby:*:*",
"matchCriteriaId": "C8CB09D2-66DD-4E05-B9FC-F1C632C6942F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "64AC442C-39CB-477C-9356-F36AF6762E53",
"versionEndIncluding": "2.6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D7B53365-0B48-4408-A4A7-9A3744F89F07",
"versionEndExcluding": "2.7.5",
"versionStartIncluding": "2.7.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*",
"matchCriteriaId": "D4499575-33A0-47D7-A88B-0E6FD2340792",
"versionEndExcluding": "3.0.3",
"versionStartIncluding": "3.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:redhat:software_collections:-:*:*:*:*:*:*:*",
"matchCriteriaId": "749804DA-4B27-492A-9ABA-6BB562A6B3AC",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
"matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
"matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
"matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:11.0:sp1:*:*:*:*:*:*",
"matchCriteriaId": "4500161F-13A0-4369-B93A-778B34E7F005",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:12.0:*:*:*:*:*:*:*",
"matchCriteriaId": "CBC8B78D-1131-4F21-919D-8AC79A410FB9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:suse:linux_enterprise:15.0:*:*:*:*:*:*:*",
"matchCriteriaId": "1607628F-77A7-4C1F-98DF-0DC50AE8627D",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:opensuse:factory:-:*:*:*:*:*:*:*",
"matchCriteriaId": "E29492E1-43D8-43BF-94E3-26A762A66FAA",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*",
"matchCriteriaId": "B009C22E-30A4-4288-BCF6-C3E81DEAF45A",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
"matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby."
},
{
"lang": "es",
"value": "CGI::Cookie.parse en Ruby versiones hasta 2.6.8, maneja inapropiadamente los prefijos de seguridad en los nombres de las cookies. Esto tambi\u00e9n afecta a CGI gem versiones hasta 0.3.0 para Ruby."
}
],
"id": "CVE-2021-41819",
"lastModified": "2026-06-17T04:08:57.577",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 5.0,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-41819",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-22T14:43:38.811242Z",
"version": "2.0.3"
}
}
]
},
"published": "2022-01-01T06:15:07.293",
"references": [
{
"source": "cve@mitre.org",
"tags": [
"Permissions Required",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/910552"
},
{
"source": "cve@mitre.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"source": "cve@mitre.org",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"source": "cve@mitre.org",
"url": "https://security.gentoo.org/glsa/202401-27"
},
{
"source": "cve@mitre.org",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"source": "cve@mitre.org",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Permissions Required",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/910552"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "https://security.gentoo.org/glsa/202401-27"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Vendor Advisory"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
}
],
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-565"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-565"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:49:05+00:00",
"cve": "CVE-2021-41819",
"id": "CVE-2021-41819",
"initial_release_date": "2021-11-24T00:00:00+00:00",
"product_status:fixed": "1127",
"product_status:known_affected": "26",
"product_status:known_not_affected": "23",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "ruby: Cookie prefix spoofing in CGI::Cookie.parse",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41819.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-02T02:22:07Z",
"cve": "CVE-2021-41819",
"id": "CVE-2021-41819",
"initial_release_date": "2023-02-15T03:37:23Z",
"product_status:known_affected": "435",
"product_status:recommended": "321",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-41819",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-41819.json",
"version": "54"
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T03:22:24.942Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://hackerone.com/reports/910552"
},
{
"tags": [
"x_transferred"
],
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"tags": [
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"name": "FEDORA-2022-82a9edac27",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"name": "FEDORA-2022-8cf0124add",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"name": "GLSA-202401-27",
"tags": [
"vendor-advisory",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/202401-27"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-41819",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-22T14:43:38.811242Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-565",
"description": "CWE-565 Reliance on Cookies without Validation and Integrity Checking",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-05-22T14:57:06.368Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-01-24T05:06:40.201Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://hackerone.com/reports/910552"
},
{
"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/"
},
{
"url": "https://security.netapp.com/advisory/ntap-20220121-0003/"
},
{
"name": "FEDORA-2022-82a9edac27",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/"
},
{
"name": "FEDORA-2022-8cf0124add",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/"
},
{
"name": "GLSA-202401-27",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/202401-27"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2021-41819",
"datePublished": "2022-01-01T00:00:00.000Z",
"dateReserved": "2021-09-29T00:00:00.000Z",
"dateUpdated": "2025-05-22T15:00:52.998Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…