CVE-2021-3999
HIGHCVSS 7.8/10EPSS 0.73%
Last modified
CVE-2021-3999 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.73% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Glibc | < 2.31 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
| Netapp | E-Series Performance Analyzer | All versions |
| Netapp | Nfs Plug-In | All versions |
| Netapp | Ontap Select Deploy Administration Utility | All versions |
| Netapp | H300s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Netapp | H410c Firmware | All versions |
References
- https://access.redhat.com/security/cve/CVE-2021-3999Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024637Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3999Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0001/Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28769Issue Tracking, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/24/4Exploit, Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3999Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024637Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3999Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0001/Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28769Issue Tracking, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2022/01/24/4Exploit, Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-3999?
CVE-2021-3999 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3999?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-3999?
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