USN-8941-1 (UBUNTU-CVE-2026-32748)
Vulnerability from osv_ubuntu – Published: 2026-10-20 13:59 – Updated: 2026-10-21 19:41 – Source website
VLAI
Summary
squid, squid3 vulnerabilities
Details
It was discovered that Squid incorrectly handled certain HTTP Transfer- Encoding headers. An attacker could possibly use this issue to perform HTTP request smuggling attacks, bypass security mechanisms, or poison web caches. (CVE-2026-61642)
It was discovered that Squid incorrectly handled certain cache digest replies, which could lead to a buffer overflow. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-50012)
It was discovered that Squid incorrectly handled parsing certain FTP directory listings. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729)
It was discovered that Squid incorrectly handled certain ICP traffic. A remote attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748, CVE-2026-33526)
It was discovered that Squid incorrectly handled certain ICP requests. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-33515)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-32748",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33515",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33526",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-47729",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-50012",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-61642",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
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},
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},
{
"binary_name": "squid3",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.12-1ubuntu7.16+esm7"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm7?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
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}
],
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}
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"versions": [
"3.3.8-1ubuntu16",
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"3.5.12-1ubuntu7.12",
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"3.5.12-1ubuntu7.15",
"3.5.12-1ubuntu7.16",
"3.5.12-1ubuntu7.16+esm1",
"3.5.12-1ubuntu7.16+esm2",
"3.5.12-1ubuntu7.16+esm3",
"3.5.12-1ubuntu7.16+esm4",
"3.5.12-1ubuntu7.16+esm5",
"3.5.12-1ubuntu7.16+esm6"
]
},
{
"database_specific": {
"cves_map": {
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{
"id": "CVE-2026-32748",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33515",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
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"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33526",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-47729",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-50012",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-61642",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squid3",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.27-1ubuntu1.14+esm6"
}
]
},
"package": {
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"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.14+esm6?arch=source\u0026distro=esm-infra/bionic"
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"versions": [
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"3.5.27-1ubuntu1.5",
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"3.5.27-1ubuntu1.7",
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"3.5.27-1ubuntu1.10",
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"3.5.27-1ubuntu1.14+esm1",
"3.5.27-1ubuntu1.14+esm2",
"3.5.27-1ubuntu1.14+esm3",
"3.5.27-1ubuntu1.14+esm4",
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},
{
"database_specific": {
"cves_map": {
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{
"id": "CVE-2026-32748",
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{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33515",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-33526",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-47729",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-50012",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-61642",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "squid",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-cgi",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-common",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squid-purge",
"binary_version": "4.10-1ubuntu1.13+esm3"
},
{
"binary_name": "squidclient",
"binary_version": "4.10-1ubuntu1.13+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@4.10-1ubuntu1.13+esm3?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
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"versions": [
"4.8-1ubuntu2",
"4.8-1ubuntu3",
"4.9-2ubuntu1",
"4.9-2ubuntu2",
"4.9-2ubuntu3",
"4.9-2ubuntu4",
"4.10-1ubuntu1",
"4.10-1ubuntu1.1",
"4.10-1ubuntu1.2",
"4.10-1ubuntu1.3",
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"4.10-1ubuntu1.5",
"4.10-1ubuntu1.6",
"4.10-1ubuntu1.7",
"4.10-1ubuntu1.8",
"4.10-1ubuntu1.9",
"4.10-1ubuntu1.10",
"4.10-1ubuntu1.11",
"4.10-1ubuntu1.12",
"4.10-1ubuntu1.13",
"4.10-1ubuntu1.13+esm1",
"4.10-1ubuntu1.13+esm2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-61642",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-cgi",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-common",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-openssl",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squid-purge",
"binary_version": "5.9-0ubuntu0.22.04.8"
},
{
"binary_name": "squidclient",
"binary_version": "5.9-0ubuntu0.22.04.8"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@5.9-0ubuntu0.22.04.8?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.9-0ubuntu0.22.04.8"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.13-10ubuntu5",
"5.2-1ubuntu1",
"5.2-1ubuntu3",
"5.2-1ubuntu4",
"5.2-1ubuntu4.1",
"5.2-1ubuntu4.2",
"5.2-1ubuntu4.3",
"5.7-0ubuntu0.22.04.1",
"5.7-0ubuntu0.22.04.2",
"5.7-0ubuntu0.22.04.3",
"5.7-0ubuntu0.22.04.4",
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"5.9-0ubuntu0.22.04.3",
"5.9-0ubuntu0.22.04.4",
"5.9-0ubuntu0.22.04.5",
"5.9-0ubuntu0.22.04.7"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-61642",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-cgi",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-common",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-openssl",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squid-purge",
"binary_version": "6.14-0ubuntu0.24.04.5"
},
{
"binary_name": "squidclient",
"binary_version": "6.14-0ubuntu0.24.04.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@6.14-0ubuntu0.24.04.5?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "6.14-0ubuntu0.24.04.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"6.1-2ubuntu1",
"6.1-2ubuntu2",
"6.5-1ubuntu1",
"6.5-1ubuntu2",
"6.5-1ubuntu3",
"6.6-1ubuntu4",
"6.6-1ubuntu5",
"6.6-1ubuntu5.1",
"6.10-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.1",
"6.13-0ubuntu0.24.04.2",
"6.13-0ubuntu0.24.04.3",
"6.14-0ubuntu0.24.04.1",
"6.14-0ubuntu0.24.04.2",
"6.14-0ubuntu0.24.04.4"
]
}
],
"aliases": [],
"details": "It was discovered that Squid incorrectly handled certain HTTP Transfer-\nEncoding headers. An attacker could possibly use this issue to perform HTTP\nrequest smuggling attacks, bypass security mechanisms, or poison web\ncaches. (CVE-2026-61642)\n\nIt was discovered that Squid incorrectly handled certain cache digest\nreplies, which could lead to a buffer overflow. A remote attacker could\npossibly use this issue to cause Squid to crash, resulting in a denial of\nservice. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and\nUbuntu 20.04 LTS. (CVE-2026-50012)\n\nIt was discovered that Squid incorrectly handled parsing certain FTP\ndirectory listings. A remote attacker could possibly use this issue to\nobtain sensitive information. This issue only affected Ubuntu 16.04 LTS,\nUbuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-47729)\n\nIt was discovered that Squid incorrectly handled certain ICP traffic. A\nremote attacker could possibly use this issue to cause Squid to crash,\nresulting in a denial of service. This issue only affected Ubuntu 16.04\nLTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-32748,\nCVE-2026-33526)\n\nIt was discovered that Squid incorrectly handled certain ICP requests. A\nremote attacker could possibly use this issue to obtain sensitive\ninformation. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,\nand Ubuntu 20.04 LTS. (CVE-2026-33515)",
"id": "USN-8941-1",
"modified": "2026-10-21T19:41:22Z",
"published": "2026-10-20T13:59:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8941-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-32748"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-33515"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-33526"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-47729"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-50012"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-61642"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "squid, squid3 vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-32748",
"UBUNTU-CVE-2026-33515",
"UBUNTU-CVE-2026-33526",
"UBUNTU-CVE-2026-47729",
"UBUNTU-CVE-2026-50012",
"UBUNTU-CVE-2026-61642"
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.