What’s Vulnerable › Vulnerabilities

CVE-2021-27419: uClibc-ng Integer Overflow or Wraparound

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-03 · updated 2026-06-17
• Weakness: CWE-190

Description

uClibc-ng versions prior to 1.0.37 are vulnerable to integer wrap-around in functions malloc-simple. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• uClibC-ng: before 1.0.37 — fixed in 1.0.37

How to fix

Upgrade to a fixed version: uClibC-ng 1.0.37. Check the vendor advisory for mitigations.

References

• https://downloads.uclibc-ng.org/releases/
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04
• https://downloads.uclibc-ng.org/releases/
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04

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