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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.

CVE-2021-27645 is a vulnerability in the nameserver caching daemon (nscd) component of the GNU C Library (glibc), versions 2.29 through 2.33. The issue arises when nscd processes a request for netgroup lookup, where a double-free condition occurs in the netgroupcache.c source code. A double-free vulnerability happens when a program attempts to free the same memory location twice, which can lead to undefined behavior including program crashes or memory corruption. In this case, the double-free causes the nscd process to crash, resulting in a denial of service (DoS) condition on the local system. Since nscd is responsible for caching name service requests such as hostname and netgroup lookups, its failure can degrade system performance and availability of name resolution services. The vulnerability requires local access with low privileges (PR:L) and has a high attack complexity (AC:H), meaning exploitation is not straightforward. No user interaction is needed (UI:N), and the scope is unchanged (S:U). The CVSS v3.1 base score is 2.5, indicating a low severity primarily due to the limited impact (availability only) and difficulty of exploitation. There are no known exploits in the wild, and no patches are linked in the provided data, but it is expected that distributions have addressed this in glibc updates following disclosure. The vulnerability is categorized under CWE-415 (Double Free).

Detailed information about CVE-2021-27645: n/a in n/a affecting n/a n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2021-27645: n/a in n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2021-27645: n/a in n/a

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