Critical severity9.8NVD Advisory· Published Apr 30, 2021· Updated Jun 17, 2026

CVE-2021-31870

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Klibc Project/Klibc
cpe:2.3:a:klibc_project:klibc:*:*:*:*:*:*:*:*
Range: <2.0.9
Debian/linux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
klibc/klibccpe-rescue2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: <2.0.9

Patches

Vulnerability mechanics

References

git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/nvdPatchThird Party Advisory
www.openwall.com/lists/oss-security/2021/04/30/1nvdMailing ListRelease NotesThird Party Advisory
kernel.org/pub/linux/libs/klibc/2.0/nvdRelease NotesThird Party Advisory
lists.debian.org/debian-lts-announce/2021/06/msg00025.htmlnvdMailing ListThird Party Advisory
lists.zytor.com/archives/klibc/2021-April/004593.htmlnvdMailing ListRelease NotesThird Party Advisory

News mentions

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cvss	0.637
epss	0.002
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000