CVE-2021-28831
HIGHCVSS 7.5/10EPSS 2.79%
Last modified
CVE-2021-28831 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.. EPSS estimates a 2.79% chance of exploitation in the next 30 days.
Description
decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Busybox | Busybox | >= 1.32.0, <= 1.32.1 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
| Debian | Debian Linux | 9.0 |
References
- https://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bdMailing List, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/04/msg00001.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202105-09Third Party Advisory
- https://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bdMailing List, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/04/msg00001.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202105-09Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28831?
decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.
How severe is CVE-2021-28831?
CVE-2021-28831 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.79% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28831?
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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Are you affected by CVE-2021-28831?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST