CVE-2021-3420

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

A flaw was found in newlib in versions prior to 4.0.0. Improper overflow validation in the memory allocation functions mEMALIGn, pvALLOc, nano_memalign, nano_valloc, nano_pvalloc could case an integer overflow, leading to an allocation of a small buffer and then to a heap-based buffer overflow.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-190

Affected software

Vendor	Product	Versions
n/a	newlib	newlib versions prior to 4.0.0

References

Timeline

Published: Mar 5, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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