High
Security advisory
A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3472
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:25 UTC · Revision 1
Source evidence
A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
osv:CVE-2021-3472
Complete source record
{
"id": "d7b9502e5c67b817301a21dc5a4167765d84fc6e27fe36f6d331e162e59e58ad",
"url": "https://osv.dev/vulnerability/CVE-2021-3472",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3472",
"summary": "A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
"evidence": "osv:CVE-2021-3472",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3472",
"aliases": [
"CVE-2021-3472"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.freedesktop.org/xorg/xserver",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "6b767cdf6574081164aa6c6a7b617cda579b84c6"
},
{
"introduced": "0d7ec5c7d9b451066a079fe56bcc9722341a91ff"
},
{
"last_affected": "0d7ec5c7d9b451066a079fe56bcc9722341a91ff"
},
{
"fixed": "7aaf54a1884f71dc363f0b884e57bcb67407a6cd"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.20.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "7aaf54a1884f71dc363f0b884e57bcb67407a6cd"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"7.0",
"XORG-7_0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3472.json",
"vanir_signatures": [
{
"id": "CVE-2021-3472-405cf82e",
"digest": {
"threshold": 0.9,
"line_hashes": [
"292591907350474845185383934296722325623",
"303364087205550092765687958017342392166",
"19102639589196602912811957206626347227",
"255171885618665939205673060985879529004"
]
},
"source": "https://gitlab.freedesktop.org/xorg/xserver@7aaf54a1884f71dc363f0b884e57bcb67407a6cd",
"target": {
"file": "Xi/chgfctl.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-3472-afb01050",
"digest": {
"length": 2476,
"function_hash": "226544378372652833531133305372092978257"
},
"source": "https://gitlab.freedesktop.org/xorg/xserver@7aaf54a1884f71dc363f0b884e57bcb67407a6cd",
"target": {
"file": "Xi/chgfctl.c",
"function": "ProcXChangeFeedbackControl"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T13:30:48Z"
}
}
],
"modified": "2026-10-20T13:30:48.469018709Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MDF7TAJE7NPZPNVOXSD5HBIFLNPUOD2V/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MO6S5OPXUDYBSRSVWVLFLJ6AFERG4HNY/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N63KL3T22HNFT4FJ7VMVF6U5Q4RFJIQF/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PEXPCLMVU25AUZTUXC4MYBGPKOAIM5TW/",
"https://lists.debian.org/debian-lts-announce/2021/04/msg00013.html",
"https://security.gentoo.org/glsa/202104-02",
"https://www.debian.org/security/2021/dsa-4893",
"https://www.tenable.com/plugins/nessus/148701",
"https://www.zerodayinitiative.com/advisories/ZDI-21-463/",
"https://bugzilla.redhat.com/show_bug.cgi?id=1944167",
"https://gitlab.freedesktop.org/xorg/xserver/-/commit/7aaf54a1884f71dc363f0b884e57bcb67407a6cd",
"https://lists.x.org/archives/xorg-announce/2021-April/003080.html",
"https://seclists.org/oss-sec/2021/q2/20"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "32"
},
{
"last_affected": "32"
},
{
"introduced": "33"
},
{
"last_affected": "33"
},
{
"introduced": "34"
},
{
"last_affected": "34"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-3472",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 387767,
"published_at": "2021-04-26T15:15:07.857+00:00"
}