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 v3.1

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

CVSS v3.1

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

EPSS

0.75% chance of exploitation in the next 30 days, 52th percentile

Published

2022-08-24

Updated

2025-12-02

Proof-of-concept exploits (1)

• https://www.openwall.com/lists/oss-security/2022/01/24/4

References

• CVE Record
• NVD entry

Related

• CVE-2021-3994
• CVE-2021-4000
• CVE-2021-3993
• CVE-2021-4002
• CVE-2021-3992
• CVE-2021-4005