CVE-2023-4527 | Glibc: stack read overflow in getaddrinfo in no-aaaa mode

Exp

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.

Published: 2023-09-18 Last update: 2026-05-12 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-4527 is rated High Exploit Risk (67.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.51%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.40% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-4527

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-4527

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.11% 1.51% +1.40%
2 2025-11-21 1.83% 0.11% -1.73%
3 2025-11-18 — 1.83% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-4527

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 4.2 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 4.2 [email protected]

Weakness enumeration for CVE-2023-4527

GitHub Security Advisory for CVE-2023-4527

GHSA-hmf7-f8gf-8f4p · Severity: medium — A flaw was found in glibc. When the getaddrinfo function is called with the AF_UNSPEC address...

OS Trackers for CVE-2023-4527

vendor priority summary link
debian unimportant CVE-2023-4527 unimportant priority: Debian including 1 source packages (glibc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2023-4527
gentoo high CVE-2023-4527: 1 GLSA(s) (202310-03), 1 atom(s) (sys-libs/glibc); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-4527
redhat medium — https://access.redhat.com/security/cve/CVE-2023-4527
suse high CVE-2023-4527 severity important: SUSE including 514 source package names (compat-libpthread-nonshared-2.28-225.el8_8.6, glibc, …), 859 product×package rows across 52 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (52 product lines)): Fixed 496, Known Not Affected 363. https://www.suse.com/security/cve/CVE-2023-4527/
ubuntu medium CVE-2023-4527 medium priority: Ubuntu including 2 source packages (eglibc, glibc), 18 status rows across 9 suites (bionic, focal, jammy, lunar, mantic, noble, trusty, upstream, xenial): DNE 7, not-affected 5, released 3, needs-triage 2, ignored 1. https://ubuntu.com/security/CVE-2023-4527

Affected software / configurations for CVE-2023-4527

Vendor Product Version Raw CPE
gnu glibc >= 2.36, < 2.36.113 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
gnu glibc >= 2.37, < 2.37.38 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
gnu glibc >= 2.38, < 2.38.19 cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
redhat codeready_linux_builder_eus 9.2 cpe:2.3:a:redhat:codeready_linux_builder_eus:9.2:*:*:*:*:*:*:*
redhat codeready_linux_builder_eus_for_power_little_endian 9.0_ppc64le cpe:2.3:a:redhat:codeready_linux_builder_eus_for_power_little_endian:9.0_ppc64le:*:*:*:*:*:*:*
redhat codeready_linux_builder_eus_for_power_little_endian_eus 9.2_ppc64le cpe:2.3:a:redhat:codeready_linux_builder_eus_for_power_little_endian_eus:9.2_ppc64le:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_arm64 9.0_aarch64 cpe:2.3:a:redhat:codeready_linux_builder_for_arm64:9.0_aarch64:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_arm64_eus 9.2_aarch64 cpe:2.3:a:redhat:codeready_linux_builder_for_arm64_eus:9.2_aarch64:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_ibm_z_systems 9.0_s390x cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems:9.0_s390x:*:*:*:*:*:*:*
redhat codeready_linux_builder_for_ibm_z_systems_eus 9.2_s390x cpe:2.3:a:redhat:codeready_linux_builder_for_ibm_z_systems_eus:9.2_s390x:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
redhat enterprise_linux 9.0 cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
redhat enterprise_linux_eus 8.8 cpe:2.3:o:redhat:enterprise_linux_eus:8.8:*:*:*:*:*:*:*
redhat enterprise_linux_eus 9.2 cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:*
redhat enterprise_linux_for_arm_64 9.0_aarch64 cpe:2.3:o:redhat:enterprise_linux_for_arm_64:9.0_aarch64:*:*:*:*:*:*:*
redhat enterprise_linux_for_arm_64_eus 9.2_aarch64 cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus:9.2_aarch64:*:*:*:*:*:*:*
redhat enterprise_linux_for_ibm_z_systems 8.0_s390x cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0_s390x:*:*:*:*:*:*:*
redhat enterprise_linux_for_ibm_z_systems_eus 8.8_s390x cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.8_s390x:*:*:*:*:*:*:*
redhat enterprise_linux_for_ibm_z_systems_eus_s390x 9.2 cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus_s390x:9.2:*:*:*:*:*:*:*
redhat enterprise_linux_for_ibm_z_systems_s390x 9.2 cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_s390x:9.2:*:*:*:*:*:*:*
redhat enterprise_linux_for_power_little_endian 8.0_ppc64le cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0_ppc64le:*:*:*:*:*:*:*
redhat enterprise_linux_for_power_little_endian 9.2_ppc64le cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:9.2_ppc64le:*:*:*:*:*:*:*
redhat enterprise_linux_for_power_little_endian_eus 8.8_ppc64le cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.8_ppc64le:*:*:*:*:*:*:*
redhat enterprise_linux_for_power_little_endian_eus 9.2_ppc64le cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:9.2_ppc64le:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 9.2 cpe:2.3:o:redhat:enterprise_linux_server_aus:9.2:*:*:*:*:*:*:*
redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 9.2_ppc64le cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:9.2_ppc64le:*:*:*:*:*:*:*
redhat enterprise_linux_tus 8.8 cpe:2.3:o:redhat:enterprise_linux_tus:8.8:*:*:*:*:*:*:*
fedoraproject fedora 37 cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
fedoraproject fedora 38 cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
fedoraproject fedora 39 cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
netapp h300s_firmware — cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
netapp h500s_firmware — cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
netapp h700s_firmware — cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
netapp h410s_firmware — cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
netapp h410c_firmware — cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*

References for CVE-2023-4527

URL Tags
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 Exploit Issue Tracking Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/09/25/1 Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/ Mailing List Third 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
cvelogic Threat Intelligence