CVE-2019-17023 (GCVE-0-2019-17023)
Vulnerability from cvelistv5 – Published: 2020-01-08 21:30 – Updated: 2024-08-05 01:24
VLAI
EPSS
VEX
Summary
After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox < 72.
Severity
6.5 (Medium)
CWE
- NSS may negotiate TLS 1.2 or below after a TLS 1.3 HelloRetryRequest had been sent
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1590001 | x_refsource_MISC |
| https://www.mozilla.org/security/advisories/mfsa2… | x_refsource_CONFIRM |
| https://usn.ubuntu.com/4234-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://usn.ubuntu.com/4397-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://www.debian.org/security/2020/dsa-4726 | vendor-advisoryx_refsource_DEBIAN |
Impacted products
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T01:24:48.748Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
},
{
"name": "USN-4234-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"name": "USN-4397-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"name": "DSA-4726",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"status": "affected",
"version": "before 72"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox \u003c 72."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "NSS may negotiate TLS 1.2 or below after a TLS 1.3 HelloRetryRequest had been sent",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2020-07-18T15:06:08.000Z",
"orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"shortName": "mozilla"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
},
{
"name": "USN-4234-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"name": "USN-4397-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"name": "DSA-4726",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "security@mozilla.org",
"ID": "CVE-2019-17023",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Firefox",
"version": {
"version_data": [
{
"version_value": "before 72"
}
]
}
}
]
},
"vendor_name": "Mozilla"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox \u003c 72."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "NSS may negotiate TLS 1.2 or below after a TLS 1.3 HelloRetryRequest had been sent"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001",
"refsource": "MISC",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"name": "https://www.mozilla.org/security/advisories/mfsa2020-01/",
"refsource": "CONFIRM",
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
},
{
"name": "USN-4234-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"name": "USN-4397-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"name": "DSA-4726",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2020/dsa-4726"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
"assignerShortName": "mozilla",
"cveId": "CVE-2019-17023",
"datePublished": "2020-01-08T21:30:29.000Z",
"dateReserved": "2019-09-30T00:00:00.000Z",
"dateUpdated": "2024-08-05T01:24:48.748Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2019-17023",
"date": "2026-09-19",
"epss": "0.0134",
"percentile": "0.70049"
},
"fkie_nvd": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1398139B-C837-4BF4-8555-5D722B91F646",
"versionEndExcluding": "72.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*",
"matchCriteriaId": "CD783B0C-9246-47D9-A937-6144FE8BFF0F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*",
"matchCriteriaId": "A31C8344-3E02-4EB8-8BD8-4C84B7959624",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox \u003c 72."
},
{
"lang": "es",
"value": "Despu\u00e9s de que HelloRetryRequest haya sido enviado, el cliente puede negociar un protocolo inferior que TLS versi\u00f3n 1.3, resultando en una transici\u00f3n de estado no v\u00e1lida en TLS State Machine. Si el cliente entra en este estado, los registros de Datos de Aplicaci\u00f3n entrantes serian ignorados. Esta vulnerabilidad afecta a Firefox versiones anteriores a la versi\u00f3n 72."
}
],
"id": "CVE-2019-17023",
"lastModified": "2024-11-21T04:31:33.987",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-01-08T22:15:12.827",
"references": [
{
"source": "security@mozilla.org",
"tags": [
"Issue Tracking",
"Permissions Required"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "security@mozilla.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Permissions Required"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
}
],
"sourceIdentifier": "security@mozilla.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-287"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"nvd": {
"cve": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
"matchCriteriaId": "1398139B-C837-4BF4-8555-5D722B91F646",
"versionEndExcluding": "72.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*",
"matchCriteriaId": "CD783B0C-9246-47D9-A937-6144FE8BFF0F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*",
"matchCriteriaId": "A31C8344-3E02-4EB8-8BD8-4C84B7959624",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*",
"matchCriteriaId": "902B8056-9E37-443B-8905-8AA93E2447FB",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored. This vulnerability affects Firefox \u003c 72."
},
{
"lang": "es",
"value": "Despu\u00e9s de que HelloRetryRequest haya sido enviado, el cliente puede negociar un protocolo inferior que TLS versi\u00f3n 1.3, resultando en una transici\u00f3n de estado no v\u00e1lida en TLS State Machine. Si el cliente entra en este estado, los registros de Datos de Aplicaci\u00f3n entrantes serian ignorados. Esta vulnerabilidad afecta a Firefox versiones anteriores a la versi\u00f3n 72."
}
],
"id": "CVE-2019-17023",
"lastModified": "2024-11-21T04:31:33.987",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-01-08T22:15:12.827",
"references": [
{
"source": "security@mozilla.org",
"tags": [
"Issue Tracking",
"Permissions Required"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"source": "security@mozilla.org",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "security@mozilla.org",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Issue Tracking",
"Permissions Required"
],
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1590001"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4234-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://usn.ubuntu.com/4397-1/"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://www.debian.org/security/2020/dsa-4726"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Vendor Advisory"
],
"url": "https://www.mozilla.org/security/advisories/mfsa2020-01/"
}
],
"sourceIdentifier": "security@mozilla.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-287"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-27T00:04:41+00:00",
"cve": "CVE-2019-17023",
"id": "CVE-2019-17023",
"initial_release_date": "2019-01-01T00:00:00+00:00",
"product_status:fixed": "332",
"product_status:known_affected": "7",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "nss: TLS 1.3 HelloRetryRequest downgrade request sets client into invalid state",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-17023.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-07-09T03:45:32Z",
"cve": "CVE-2019-17023",
"id": "CVE-2019-17023",
"initial_release_date": "2023-02-15T04:07:41Z",
"product_status:known_affected": "21",
"product_status:recommended": "34",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2019-17023",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2019-17023.json",
"version": "15"
}
}
}
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…