CVE-2021-4011
HIGHCVSS 7.8/10EPSS 0.56%
Last modified
CVE-2021-4011 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.56% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| X.Org | X Server | < 1.20.14 |
| X.Org | X Server | 21.1.0 |
| X.Org | X Server | 21.1.1 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Fedora | 35 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- https://lists.debian.org/debian-lts-announce/2021/12/msg00035.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220114-0004/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5027Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1550/Third Party Advisory, VDB Entry
- https://lists.debian.org/debian-lts-announce/2021/12/msg00035.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220114-0004/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5027Third Party Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1550/Third Party Advisory, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-4011?
CVE-2021-4011 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4011?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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