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 dou…

Code

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No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Feb 24, 2021 · NIST NVD

   Detected

   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.

2. Oct 14, 2026 · NIST NVD

   Updated

   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.

Affected

• cpe debian/debian linux10.0
• cpe fedoraproject/fedora33
• cpe fedoraproject/fedora34
• cpe gnu/glibcversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2021-27645

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-27645

  30-day exploitation probability 0.4%

  first.org
• NIST NVDVulnerability recordCVE-2021-27645

  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

  nvd.nist.gov

References

• Mailing List · lists.debian.org
• Reference · lists.fedoraproject.org
• Reference · lists.fedoraproject.org
• Third Party Advisory · security.gentoo.org
• Issue Tracking · sourceware.org