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CVE-2021-3999

7.8 · HIGH

A flaw was found in glibc.

Published Aug 24, 2022CWE-193EPSS 0.80%

Overview

CVE-2021-3999 is a high-severity vulnerability. It was published on August 24, 2022 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.

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

Refaccess.redhat.com/security/cve/CVE-2021-3999Refbugzilla.redhat.com/show_bug.cgi?id=2024637Reflists.debian.org/debian-lts-announce/2022/10/msg00021.htmlRefsecurity-tracker.debian.org/tracker/CVE-2021-3999Refsecurity.netapp.com/advisory/ntap-20221104-0001/Refsourceware.org/bugzilla/show_bug.cgi?id=28769Refsourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5eRefwww.openwall.com/lists/oss-security/2022/01/24/4Refaccess.redhat.com/security/cve/CVE-2021-3999Refbugzilla.redhat.com/show_bug.cgi?id=2024637

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3999?

CVE-2021-3999 is a high-severity vulnerability. It was published on August 24, 2022 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-3999?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-3999?

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-2021-3999?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3999 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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