Out-of-bounds Read in GNU Glibc
CVE-2021-3998
A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2022/01/24/4 (Patch, Mailing List, Third Party Advisory)
- sourceware.org/bugzilla/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- sourceware.org/git/gitweb.cgi
- sourceware.org/git/gitweb.cgi
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- access.redhat.com/security/cve/CVE-2021-3998 (Third Party Advisory)
- security-tracker.debian.org/tracker/CVE-2021-3998 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20221020-0003/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3998?
- CVE-2021-3998 is a high-severity vulnerability in GNU Glibc, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2022-08-24.
- How severe is CVE-2021-3998?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-3998 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.