Vulnerability in GNU Glibc
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2022/01/24/4 (Exploit, Mailing List, Third Party Advisory)
- sourceware.org/bugzilla/show_bug.cgi (Third Party Advisory, Issue Tracking)
- sourceware.org/git/gitweb.cgi
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-3999 (Third Party Advisory)
- security-tracker.debian.org/tracker/CVE-2021-3999 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20221104-0001/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3999?
- CVE-2021-3999 is a high-severity vulnerability in GNU Glibc, classified under Off-by-one Error. CVSS score: 7.8/10. Published 2022-08-24.
- How severe is CVE-2021-3999?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-3999 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.