CVE-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 dou…
Published Feb 24, 2021 · updated Oct 14, 2026 · gnu glibc
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.
Timeline
Detection, updates, and resolution for this record.
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.
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.orgCVE-2021-27645
Official CVE identifier
cve.org - FIRST EPSSCVE-2021-27645
30-day exploitation probability 0.4%
first.org - NIST NVDCVE-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