CVE-2021-31870
CRITICALCVSS 9.8/10EPSS 2.06%
Last modified
CVE-2021-31870 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in klibc before 2.0.9. Multiplication in the calloc() function may result in an integer overflow and a subsequent heap buffer overflow.. EPSS estimates a 2.06% chance of exploitation in the next 30 days.
Description
An issue was discovered in klibc before 2.0.9. Multiplication in the calloc() function may result in an integer overflow and a subsequent heap buffer overflow.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Klibc Project | Klibc | < 2.0.9 |
| Debian | Debian Linux | 9.0 |
References
- http://www.openwall.com/lists/oss-security/2021/04/30/1Mailing List, Release Notes, Third Party Advisory
- https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=292650f04c2b5348b4efbad61fb014ed09b4f3f2Patch, Third Party Advisory
- https://kernel.org/pub/linux/libs/klibc/2.0/Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00025.htmlMailing List, Third Party Advisory
- https://lists.zytor.com/archives/klibc/2021-April/004593.htmlMailing List, Release Notes, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/04/30/1Mailing List, Release Notes, Third Party Advisory
- https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=292650f04c2b5348b4efbad61fb014ed09b4f3f2Patch, Third Party Advisory
- https://kernel.org/pub/linux/libs/klibc/2.0/Release Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00025.htmlMailing List, Third Party Advisory
- https://lists.zytor.com/archives/klibc/2021-April/004593.htmlMailing List, Release Notes, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-31870?
An issue was discovered in klibc before 2.0.9. Multiplication in the calloc() function may result in an integer overflow and a subsequent heap buffer overflow.
How severe is CVE-2021-31870?
CVE-2021-31870 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.06% probability of exploitation in the next 30 days.
How do I fix CVE-2021-31870?
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-2021-31870?
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