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Vulnerability record · CVE-2021-27419 · published 3 May 2022

CVE-2021-27419: Uclibc-ng project uclibc-ng integer overflow vulnerability

UUclibc Ng Project · Uclibc Ng

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.

9.8 CVSS 3.1 Critical EPSS 1.7% · top 23.4% CWE-190 · Integer overflow
9.8CVSS 3.1 base score, v2 7.5
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://downloads.uclibc-ng.org/releases/ ProductRelease NotesVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04 Third Party AdvisoryUS Government Resource
https://downloads.uclibc-ng.org/releases/ ProductRelease NotesVendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-29503Uclibc memory buffer overflow vulnerabilityA memory corruption vulnerability exists in the libpthread linuxthreads functionality of uClibC 0.9.33.2 and uClibC-ng 1.0.40. Thread allocation can …EPSS 1.3%9.6CVE-2021-43523Uclibc cross-site scripting vulnerabilityIn uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinf…EPSS 3.1%7.5CVE-2016-2224Uclibc-ng project uclibc-ng uncontrolled resource consumption vulnerabilityThe __decode_dotted function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows remote DNS servers to cause a denial of service (infinite loop) …EPSS 2.8%7.5CVE-2016-2225Uclibc-ng project uclibc-ng uncontrolled resource consumption vulnerabilityThe __read_etc_hosts_r function in libc/inet/resolv.c in uClibc-ng before 1.0.12 allows remote DNS servers to cause a denial of service (infinite loo…EPSS 2.5%7.5CVE-2016-6264Uclibc vulnerabilityInteger signedness error in libc/string/arm/memset.S in uClibc and uClibc-ng before 1.0.16 allows context-dependent attackers to cause a denial of se…EPSS 2.7%6.5CVE-2022-30295Uclibc vulnerabilityuClibc-ng through 1.0.40 and uClibc through 0.9.33.2 use predictable DNS transaction IDs that may lead to DNS cache poisoning. This is related to a r…EPSS 12%8.4CVE-2025-48595Android Framework integer overflow enables local code executionAn integer overflow in multiple locations of the Android Framework can be turned into code execution. It allows a local attacker to escalate privileg…KEVEPSS 1.7%analysed7.8CVE-2021-30952Apple WebKit integer overflow allows code execution via crafted web contentAn integer overflow in Apple's WebKit engine was fixed by improved input validation across tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS/iPadOS 15…KEVEPSS 7.0%analysed

Source: NIST National Vulnerability Database (record CVE-2021-27419), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.