CVE-2021-20266
MEDIUMCVSS 4.9/10EPSS 1.71%
Last modified
CVE-2021-20266 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. A flaw was found in RPM's hdrblobInit() in lib/header.c. This flaw allows an attacker who can modify the rpmdb to cause an out-of-bounds read. EPSS estimates a 1.71% chance of exploitation in the next 30 days.
Description
A flaw was found in RPM's hdrblobInit() in lib/header.c. This flaw allows an attacker who can modify the rpmdb to cause an out-of-bounds read. The highest threat from this vulnerability is to system availability.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Rpm | Rpm | < 4.16.1.3 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1927741Issue Tracking, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202107-43Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1927741Issue Tracking, Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202107-43Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20266?
A flaw was found in RPM's hdrblobInit() in lib/header.c. This flaw allows an attacker who can modify the rpmdb to cause an out-of-bounds read. The highest threat from this vulnerability is to system availability.
How severe is CVE-2021-20266?
CVE-2021-20266 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20266?
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-2021-20266?
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