Vulnerability Details : 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 double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.
Vulnerability category: Memory CorruptionDenial of service
Products affected by CVE-2021-27645
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27645
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 14 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27645
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
1.9
|
LOW | AV:L/AC:M/Au:N/C:N/I:N/A:P |
3.4
|
2.9
|
NIST | |
2.5
|
LOW | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L |
1.0
|
1.4
|
NIST |
CWE ids for CVE-2021-27645
-
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-27645
-
https://security.gentoo.org/glsa/202107-07
glibc: Multiple vulnerabilities (GLSA 202107-07) — Gentoo securityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7LZNT6KTMCCWPWXEOGSHD3YLYZKUGMH5/
[SECURITY] Fedora 33 Update: glibc-2.32-6.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2022/10/msg00021.html
[SECURITY] [DLA 3152-1] glibc security updateMailing List;Third Party Advisory
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https://sourceware.org/bugzilla/show_bug.cgi?id=27462
27462 – (CVE-2021-27645) double-free in nscd (CVE-2021-27645)Issue Tracking;Patch;Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7TS26LIZSOBLGJEZMJX4PXT5BQDE2WS/
[SECURITY] Fedora 34 Update: glibc-2.33-5.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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