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Vulnerability record · CVE-2023-4527 · published 18 September 2023

CVE-2023-4527: Gnu glibc stack-based buffer overflow vulnerability

Gnu · Glibc

A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.

6.5 CVSS 3.1 Medium EPSS 1.7% · top 24.2% CWE-121 · Stack-based buffer overflowCWE-125 · Out-of-bounds read
6.5CVSS 3.1 base score
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
27Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address family and the system is configured with no-aaaa mode via /etc/resolv.conf, a DNS response via TCP larger than 2048 bytes can potentially disclose stack contents through the function returned address data, and may cause a crash.

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

Affected products

27 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4527 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2234712 ExploitIssue TrackingThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/09/25/1 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-4527 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2234712 ExploitIssue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGF Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2 Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3J Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202310-03 Third Party Advisory
https://security.netapp.com/advisory/ntap-20231116-0012/ Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-831302.html

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Source: NIST National Vulnerability Database (record CVE-2023-4527), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.