CVE-2021-3999

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

7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-25)

CWE

CWE-193

Published

2022-08-24

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• debian:debian_linux
• gnu:glibc
• netapp:e-series_performance_analyzer
• netapp:h300s_firmware
• netapp:h410c_firmware
• netapp:h410s_firmware
• netapp:h500s_firmware
• netapp:h700s_firmware
• netapp:nfs_plug-in
• netapp:ontap_select_deploy_administration_utility

References

• https://access.redhat.com/security/cve/CVE-2021-3999
• https://bugzilla.redhat.com/show_bug.cgi?id=2024637
• https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
• https://security-tracker.debian.org/tracker/CVE-2021-3999
• https://security.netapp.com/advisory/ntap-20221104-0001/

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