CVE-2021-4207

A flaw was found in the QXL display device emulation in QEMU. A double fetch of guest controlled values `cursor->header.width` and `cursor->header.height` can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. A malicious privileged guest user could use this flaw to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.

• CWE-362
• CWE-120
• CWE-362

• https://bugzilla.redhat.com/show_bug.cgi?id=2036966Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://starlabs.sg/advisories/21-4207/Exploit, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5133Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2036966Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-27Third Party Advisory
• https://security.netapp.com/advisory/ntap-20250321-0009/
• https://starlabs.sg/advisories/21-4207/Exploit, Third Party Advisory
• https://www.debian.org/security/2022/dsa-5133Third Party Advisory

Published

Apr 29, 2022

Last Modified

Jun 17, 2026

Status

Modified

• 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.

• CVE-2021-42063A security vulnerability has been discovered in the SAP Know…6.1
• CVE-2021-42064If configured to use an Oracle database and if a query is cr…9.8
• CVE-2021-42066SAP Business One - version 10.0, allows an admin user to vie…4.4
• CVE-2021-42067In SAP NetWeaver AS for ABAP and ABAP Platform - versions 70…4.3
• CVE-2021-42068When a user opens a manipulated GIF (.gif) file received fro…3.3
• CVE-2021-42069When a user opens manipulated Tagged Image File Format (.tif…3.3
• CVE-2021-42070When a user opens manipulated Jupiter Tessellation (.jt) fil…3.3
• CVE-2021-42071In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attack…9.8
• CVE-2021-42072An issue was discovered in Barrier before 2.4.0. The barrier…8.8
• CVE-2021-42073An issue was discovered in Barrier before 2.4.0. An attacker…8.2
• CVE-2021-42074An issue was discovered in Barrier before 2.3.4. An unauthen…7.5
• CVE-2021-42075An issue was discovered in Barrier before 2.3.4. The barrier…7.5