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Vulnerability record · CVE-2021-3999 · published 24 August 2022

CVE-2021-3999: Gnu glibc vulnerability

Gnu · Glibc

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.

7.8 CVSS 3.1 High EPSS 0.75% · top 46.8% CWE-193 · CWE-193
7.8CVSS 3.1 base score
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

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

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-3999 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024637 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html Mailing ListThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-3999 Third Party Advisory
https://security.netapp.com/advisory/ntap-20221104-0001/ Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=28769 Issue TrackingThird Party Advisory
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
https://www.openwall.com/lists/oss-security/2022/01/24/4 ExploitMailing ListThird Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3999 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024637 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html Mailing ListThird Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-3999 Third Party Advisory
https://security.netapp.com/advisory/ntap-20221104-0001/ Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=28769 Issue TrackingThird Party Advisory
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
https://www.openwall.com/lists/oss-security/2022/01/24/4 ExploitMailing ListThird Party Advisory

Track CVE-2021-3999 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-3999), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.