CVE-2021-4207
Last modified
CVE-2021-4207 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. 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. EPSS estimates a 0.40% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Qemu | Qemu | < 7.0.0 |
| Redhat | Enterprise Linux | 8.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- 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://starlabs.sg/advisories/21-4207/Exploit, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5133Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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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.
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