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CVE-2021-35942

9.1 · CRITICAL

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially…

Published Jul 22, 2021CWE-190EPSS 2.75%

Overview

CVE-2021-35942 is a critical-severity vulnerability. It was published on July 22, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.debian.org/debian-lts-announce/2022/10/msg00021.htmlRefsecurity.gentoo.org/glsa/202208-24Refsecurity.netapp.com/advisory/ntap-20210827-0005/Refsourceware.org/bugzilla/show_bug.cgi?id=28011Refsourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=5adda61f62b77384718b4c0d8336ade8f2b4b35cRefsourceware.org/glibc/wiki/Security%20ExceptionsReflists.debian.org/debian-lts-announce/2022/10/msg00021.htmlRefsecurity.gentoo.org/glsa/202208-24Refsecurity.netapp.com/advisory/ntap-20210827-0005/Refsourceware.org/bugzilla/show_bug.cgi?id=28011

How CyberStrike helps

Frequently asked questions

What is CVE-2021-35942?

CVE-2021-35942 is a critical-severity vulnerability. It was published on July 22, 2021 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2021-35942?

This vulnerability has a CVSS 3.1 base score of 9.1, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-35942?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-35942?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-35942 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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