Buffer overflow in X.org X Server
CVE-2021-4011
A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- X.org X Server — versions 21.1.0, 21.1.1
- Debian Linux — versions 9.0, 10.0, 11.0
- Fedoraproject Fedora — versions 34, 35
- Xorg-X11-Server — versions xorg-x11-server 21.1.2, xorg-x11-server 1.20.14
Weakness classification (CWE)
References
- lists.x.org/archives/xorg-announce/2021-December/003122.html (Vendor Advisory)
- lists.x.org/archives/xorg-announce/2021-December/003124.html (Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-1550/ (VDB Entry, Third Party Advisory)
- www.debian.org/security/2021/dsa-5027 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/12/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20220114-0004/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-4011?
- CVE-2021-4011 is a high-severity vulnerability in X.org X Server, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2021-12-17.
- How severe is CVE-2021-4011?
- High severity. CVSS v3 base score is 7.8 out of 10.