GSD-2020-1935
Vulnerability from gsd - Updated: 2023-12-13 01:21Details
In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2020-1935",
"description": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.",
"id": "GSD-2020-1935",
"references": [
"https://www.suse.com/security/cve/CVE-2020-1935.html",
"https://www.debian.org/security/2020/dsa-4680",
"https://www.debian.org/security/2020/dsa-4673",
"https://access.redhat.com/errata/RHSA-2021:3140",
"https://access.redhat.com/errata/RHSA-2021:1030",
"https://access.redhat.com/errata/RHSA-2021:0882",
"https://access.redhat.com/errata/RHSA-2020:5020",
"https://access.redhat.com/errata/RHSA-2020:4847",
"https://access.redhat.com/errata/RHSA-2020:3305",
"https://access.redhat.com/errata/RHSA-2020:3303",
"https://access.redhat.com/errata/RHSA-2020:2367",
"https://access.redhat.com/errata/RHSA-2020:1521",
"https://access.redhat.com/errata/RHSA-2020:1520",
"https://ubuntu.com/security/CVE-2020-1935",
"https://advisories.mageia.org/CVE-2020-1935.html",
"https://alas.aws.amazon.com/cve/html/CVE-2020-1935.html",
"https://linux.oracle.com/cve/CVE-2020-1935.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2020-1935"
],
"details": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.",
"id": "GSD-2020-1935",
"modified": "2023-12-13T01:21:58.182188Z",
"schema_version": "1.4.0"
}
},
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{
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"value": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely."
}
]
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"references": {
"reference_data": [
{
"name": "[tomcat-announce] 20200224 [SECURITY] CVE-2020-1935 HTTP Request Smuggling",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E"
},
{
"name": "[debian-lts-announce] 20200304 [SECURITY] [DLA 2133-1] tomcat7 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html"
},
{
"name": "openSUSE-SU-2020:0345",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html"
},
{
"name": "[tomee-commits] 20200320 [jira] [Created] (TOMEE-2790) TomEE plus(7.0.7) is affected by CVE-2020-1935 \u0026 CVE-2019-17569 vulnerabilities",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E"
},
{
"name": "[tomee-commits] 20200323 [jira] [Commented] (TOMEE-2790) TomEE plus(7.0.7) is affected by CVE-2020-1935 \u0026 CVE-2019-17569 vulnerabilities",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E"
},
{
"name": "DSA-4673",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2020/dsa-4673"
},
{
"name": "DSA-4680",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2020/dsa-4680"
},
{
"name": "[debian-lts-announce] 20200528 [SECURITY] [DLA 2209-1] tomcat8 security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpujul2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpujul2020.html"
},
{
"name": "https://security.netapp.com/advisory/ntap-20200327-0005/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20200327-0005/"
},
{
"name": "[tomcat-users] 20200724 CVE-2020-1935",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E"
},
{
"name": "[tomcat-users] 20200724 Re: CVE-2020-1935",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E"
},
{
"name": "[tomcat-users] 20200724 RE: CVE-2020-1935",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E"
},
{
"name": "[tomcat-users] 20200726 Re: CVE-2020-1935",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E"
},
{
"name": "[tomcat-users] 20200727 RE: CVE-2020-1935",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E"
},
{
"name": "USN-4448-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4448-1/"
},
{
"name": "https://www.oracle.com/security-alerts/cpuoct2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpujan2021.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpujan2021.html"
},
{
"name": "[tomcat-dev] 20210428 [Bug 65272] Problems proccessing HTTP request without CR in last versions",
"refsource": "MLIST",
"url": "https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E"
}
]
}
},
"gitlab.com": {
"advisories": [
{
"affected_range": "(,7.0.100),[8.0.0,8.5.51),[9.0.0,9.0.31)",
"affected_versions": "All versions before 7.0.100, all versions starting from 8.0.0 before 8.5.51, all versions starting from 9.0.0 before 9.0.31",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-444",
"CWE-707",
"CWE-937"
],
"date": "2021-08-19",
"description": "In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.",
"fixed_versions": [
"7.0.100",
"8.5.51",
"9.0.31"
],
"identifier": "CVE-2020-1935",
"identifiers": [
"GHSA-qxf4-chvg-4r8r",
"CVE-2020-1935"
],
"not_impacted": "All versions starting from 7.0.100 before 8.0.0, all versions starting from 8.5.51 before 9.0.0, all versions starting from 9.0.31",
"package_slug": "maven/org.apache.tomcat.embed/tomcat-embed-core",
"pubdate": "2020-02-28",
"solution": "Upgrade to versions 7.0.100, 8.5.51, 9.0.31 or above.",
"title": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request Smuggling\u0027)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-1935",
"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E",
"https://lists.debian.org/debian-lts-announce/2020/03/msg00006.html",
"http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00025.html",
"https://lists.debian.org/debian-lts-announce/2020/05/msg00026.html",
"https://security.netapp.com/advisory/ntap-20200327-0005/",
"https://www.debian.org/security/2020/dsa-4673",
"https://www.debian.org/security/2020/dsa-4680",
"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E",
"https://www.oracle.com/security-alerts/cpujul2020.html",
"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E",
"https://usn.ubuntu.com/4448-1/",
"https://lists.apache.org/thread.html/r9ce7918faf347e7aac32be930bf26c233b0b140fe37af0bb294158b6@%3Cdev.tomcat.apache.org%3E",
"https://www.oracle.com/security-alerts/cpujan2021.html",
"https://www.oracle.com/security-alerts/cpuoct2020.html",
"https://github.com/advisories/GHSA-qxf4-chvg-4r8r"
],
"uuid": "c895dfeb-4fee-4bd9-ad33-de39c39af6fc"
},
{
"affected_range": "[7.0.0,7.0.99],[8.5.0,8.5.50],[9.0.0,9.0.30]",
"affected_versions": "All versions starting from 7.0.0 up to 7.0.99, all versions starting from 8.5.0 up to 8.5.50, all versions starting from 9.0.0 up to 9.0.30",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-444",
"CWE-937"
],
"date": "2021-05-04",
"description": "In Apache Tomcat M1 to to to the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.",
"fixed_versions": [
"7.0.100",
"8.5.51",
"9.0.31"
],
"identifier": "CVE-2020-1935",
"identifiers": [
"CVE-2020-1935"
],
"not_impacted": "All versions before 7.0.0, all versions after 7.0.99 before 8.5.0, all versions after 8.5.50 before 9.0.0, all versions after 9.0.30",
"package_slug": "maven/org.apache.tomcat/tomcat-coyote",
"pubdate": "2020-02-24",
"solution": "Upgrade to versions 7.0.100, 8.5.51, 9.0.31 or above.",
"title": "Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-1935",
"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E"
],
"uuid": "894341dd-3708-4af4-bc80-0080f3c6bb46"
},
{
"affected_range": "[7.0.0,7.0.99],[8.5.0,8.5.50],[9.0.0,9.0.30]",
"affected_versions": "All versions starting from 7.0.0 up to 7.0.99, all versions starting from 8.5.0 up to 8.5.50, all versions starting from 9.0.0 up to 9.0.30",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-444",
"CWE-937"
],
"date": "2021-05-04",
"description": "In Apache Tomcat, the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid `Transfer-Encoding` header in a particular manner.",
"fixed_versions": [
"7.0.100",
"8.5.51",
"9.0.31"
],
"identifier": "CVE-2020-1935",
"identifiers": [
"CVE-2020-1935"
],
"not_impacted": "All versions before 7.0.0, all versions after 7.0.99 before 8.5.0, all versions after 8.5.50 before 9.0.0, all versions after 9.0.30",
"package_slug": "maven/org.apache.tomcat/tomcat-util",
"pubdate": "2020-02-24",
"solution": "Upgrade to versions 7.0.100, 8.5.51, 9.0.31 or above.",
"title": "Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-1935",
"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E"
],
"uuid": "6086ec62-4cf0-43f7-b151-f357ac52dd27"
},
{
"affected_range": "[7.0.0,7.0.99],[8.5.0,8.5.50],[9.0.0,9.0.30]",
"affected_versions": "All versions starting from 7.0.0 up to 7.0.99, all versions starting from 8.5.0 up to 8.5.50, all versions starting from 9.0.0 up to 9.0.30",
"cvss_v2": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
"cvss_v3": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"cwe_ids": [
"CWE-1035",
"CWE-444",
"CWE-937"
],
"date": "2021-05-04",
"description": "In Apache Tomcat, the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid `Transfer-Encoding` header in a particular manner.",
"fixed_versions": [
"7.0.100",
"8.5.51",
"9.0.31"
],
"identifier": "CVE-2020-1935",
"identifiers": [
"CVE-2020-1935"
],
"not_impacted": "All versions before 7.0.0, all versions after 7.0.99 before 8.5.0, all versions after 8.5.50 before 9.0.0, all versions after 9.0.30",
"package_slug": "maven/org.apache.tomcat/tomcat",
"pubdate": "2020-02-24",
"solution": "Upgrade to versions 7.0.100, 8.5.51, 9.0.31 or above.",
"title": "Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2020-1935",
"https://lists.apache.org/thread.html/r127f76181aceffea2bd4711b03c595d0f115f63e020348fe925a916c%40%3Cannounce.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r441c1f30a252bf14b07396286f6abd8089ce4240e91323211f1a2d75@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r660cd379afe346f10d72c0eaa8459ccc95d83aff181671b7e9076919@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/r7bc994c965a34876bd94d5ff15b4e1e30b6220a15eb9b47c81915b78@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/r80e9c8417c77d52c62809168b96912bda70ddf7748f19f8210f745b1@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/ra5dee390ad2d60307b8362505c059cd6a726de4d146d63dfce1e05e7@%3Cusers.tomcat.apache.org%3E",
"https://lists.apache.org/thread.html/rc31cbabb46cdc58bbdd8519a8f64b6236b2635a3922bbeba0f0e3743@%3Ccommits.tomee.apache.org%3E",
"https://lists.apache.org/thread.html/rd547be0c9d821b4b1000a694b8e58ef9f5e2d66db03a31dfe77c4b18@%3Cusers.tomcat.apache.org%3E"
],
"uuid": "9ad56366-18f4-464d-af94-3969e56942ab"
}
]
},
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"nodes": [
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"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
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},
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}
},
"lastModifiedDate": "2021-05-04T19:19Z",
"publishedDate": "2020-02-24T22:15Z"
}
}
}
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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.
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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.
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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.
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