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CVE-2021-3472A 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…
- 7.8HighCVSS base score
- 1.1%Exploitation in 30 daysEPSS · top 35% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By redhat
- 28 days later
· 28 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.1% · top 35% of all CVEs (14 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
xorg-x11-server
- affected xorg-x11-server 1.20.11
References
References14
- [oss-security] 20210413 X.Org server security advisory: April 13, 2021 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20210415 [SECURITY] [DLA 2627-1] xorg-server security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- FEDORA-2021-139f3fc21c (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-4893 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- FEDORA-2021-0e2981e013 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2021-112d542766 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://www.zerodayinitiative.com/advisories/ZDI-21-463/ (opens in a new tab)x_refsource_MISCx_transferred
- https://lists.x.org/archives/xorg-announce/2021-April/003080.html (opens in a new tab)x_refsource_CONFIRMx_refsource_MISCx_transferred
- FEDORA-2021-f7b4c97879 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1944167 (opens in a new tab)x_refsource_MISCx_transferred
- https://seclists.org/oss-sec/2021/q2/20 (opens in a new tab)x_refsource_MISCx_transferred
- https://www.tenable.com/plugins/nessus/148701 (opens in a new tab)x_refsource_MISCx_transferred
- https://gitlab.freedesktop.org/xorg/xserver/-/commit/7aaf54a1884f71dc363f0b884e57bcb67407a6cd (opens in a new tab)x_refsource_MISCx_transferred
- GLSA-202104-02 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-26794 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-3472)Record last updated .