An issue was discovered in klibc before 2.0.9.
Priority MEDIUM 46CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.02076 81st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:klibc_project:klibc:*:*:*:*:*:*:*:* | before 2.0.9 | Vulnerable | Klibc Project |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:klibc_project:klibc:*:*:*:*:*:*:*:* Versions before 2.0.9 Vulnerable ·Klibc Project
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-31870
- 2026-10-03 Alias added: GHSA-q5g5-fc84-93h4
References
Sources
- CVE-2021-31870 · CVE Program
- CVE-2021-31870 · NVD
- FIRST EPSS
- GHSA-q5g5-fc84-93h4 · GitHub Advisory Database · CC BY 4.0
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