CVE-2023-4527
Glibc: stack read overflow in getaddrinfo in no-aaaa mode
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-121 |
| Vendor | red hat |
| Product | red hat enterprise linux 8 |
| Published | Sep 18, 2023 |
| Last Updated | Nov 20, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2023:5453 access.redhat.com: https://access.redhat.com/errata/RHSA-2023:5455 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-4527 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2234712 openwall.com: http://www.openwall.com/lists/oss-security/2023/09/25/1 lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ security.gentoo.org: https://security.gentoo.org/glsa/202310-03 security.netapp.com: https://security.netapp.com/advisory/ntap-20231116-0012/
Credits
This issue was discovered by Florian Weimer (Red Hat).