CVE-2021-27645

glibc: Use-after-free in addgetnetgrentX function in netgroupcache.c

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Severity

Low

Red Hat Product Security

2.5

CVSS 3.1

Review impact separately from score.

Published · February 24, 2021

Updated · November 21, 2025

Description

The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6), 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.

Statement

This is a local crash in nscd causing a performance penalty. It is constrained by needing a netgroup request to have a response larger than 1K to cause the double-free crash. Therefore this is not a full denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 2.5
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

CWE-416 · Use After Free