CVE-2021-27645

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Summary

CVECVE-2021-27645
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-02-24 15:15:13 UTC
Updated2026-10-14 12:17:10 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 2.5 LOW from [email protected]

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

Problem Types: CWE-415 | n/a | CWE-415 CWE-415 Double Free

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary2.5LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
3.1ADPDECLARED2.5LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary2.5LOWCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
2.0[email protected]Primary1.9AV:L/AC:M/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:L/AC:M/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 33 All All All
Operating System Fedoraproject Fedora 34 All All All
Application Gnu Glibc All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
glibc: Multiple vulnerabilities (GLSA 202107-07) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
27462 – (CVE-2021-27645) double-free in nscd (CVE-2021-27645) af854a3a-2127-422b-91ae-364da2661108 sourceware.org Issue Tracking, Patch, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-831302.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] Fedora 33 Update: glibc-2.32-6.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] Fedora 34 Update: glibc-2.33-5.fc34 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] [DLA 3152-1] glibc security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
[SECURITY] Fedora 33 Update: glibc-2.32-6.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 34 Update: glibc-2.33-5.fc34 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159493 Oracle Enterprise Linux Security Update for glibc (ELSA-2021-4358)
  • 159561 Oracle Enterprise Linux Security Update for glibc (ELSA-2021-9560)
  • 179662 Debian Security Update for glibc (CVE-2021-27645)
  • 181138 Debian Security Update for glibc (DLA 3152-1)
  • 198685 Ubuntu Security Notification for GNU C Library Vulnerabilities (USN-5310-1)
  • 239791 Red Hat Update for glibc security (RHSA-2021:4358)
  • 281092 Fedora Security Update for glibc (FEDORA-2021-2ba993d6c5)
  • 281546 Fedora Security Update for glibc (FEDORA-2021-6749bfcfd9)
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 671617 EulerOS Security Update for glibc (EulerOS-SA-2022-1565)
  • 671692 EulerOS Security Update for glibc (EulerOS-SA-2022-1724)
  • 671865 EulerOS Security Update for glibc (EulerOS-SA-2022-1889)
  • 710069 Gentoo Linux glibc Multiple vulnerabilities (GLSA 202107-07)
  • 940330 AlmaLinux Security Update for glibc (ALSA-2021:4358)

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