Integer overflow in GNU Glibc
CVE-2021-35942
The wordexp function in the GNU C Library (aka glibc) through 2.33 may crash or read arbitrary memory in parse_param (in posix/wordexp.c) when called with an untrusted, crafted pattern, potentially resulting in a denial of service or disclosure of information. This occurs because atoi was used but strtoul should have been used to ensure correct calculations.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.026 · newest: 0.028 · change: +0.001
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- sourceware.org/glibc/wiki/Security Exceptions (Not Applicable)
- sourceware.org/bugzilla/show_bug.cgi (Third Party Advisory, Issue Tracking)
- sourceware.org/git/ (Broken Link)
- security.netapp.com/advisory/ntap-20210827-0005/ (Third Party Advisory)
- security.gentoo.org/glsa/202208-24 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00021.html (mailing-list, Mailing List, Third Party Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2021-35942?
- CVE-2021-35942 is a critical-severity vulnerability in GNU Glibc, classified under Integer Overflow or Wraparound. CVSS score: 9.1/10. Published 2021-07-22.
- How severe is CVE-2021-35942?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2021-35942 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.