CVE-2021-27645

Advisory lineage Upstream: 0 Downstream: 8
Modified
Published: 24 Feb 2021, 00:00
Last modified:09 Jun 2025, 14:58

Vulnerability Summary

Overall Risk (default)
low
10/100
CVSS Score
2.5 LOW
v3.1 (cve.org)
EPSS Score
0.04% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Feb 2021, 00:00
Published
Vulnerability first disclosed
09 Jun 2025, 14:58
Last Modified
Vulnerability information updated

Description

The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.

CVSS Metrics

  • v3.1•LOW•Score: 2.5CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
  • v2.0•LOW•Score: 1.9AV:L/AC:M/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.04%• Percentile: 11%

Techniques & Countermeasures

  • CWE-415•Double Free

    The product calls free() twice on the same memory address.

Affected Systems

  • debian•debian_linux

    10.0

  • fedoraproject•fedora

    33 | 34

  • gnu•glibc

    ≥ 2.29, ≤ 2.33

References (5)