Is CVE-2023-4911 being actively exploited?

Yes. CVE-2023-4911 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on November 21, 2023.

What is the CVSS score for CVE-2023-4911?

CVE-2023-4911 has a CVSS 3.1 base score of 7.8 (HIGH).

CVE-2023-4911

HIGH · CVSS 7.8CISA KEV: actively exploitedEPSS 63.8%EU EUVD: exploited

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

Key facts

CVSS score: 7.8 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
EPSS score: 63.8% (99th percentile)
In CISA KEV: Yes, added November 21, 2023
In EU EUVD: Yes (EUVD-2023-54750)
Published: October 3, 2023
NVD last modified: October 14, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

GNU C Library Buffer Overflow Vulnerability

Added to the KEV catalog on November 21, 2023; federal remediation due December 12, 2023.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2023-54750 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 14, 2026.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
fedoraproject / fedora
fedoraproject / fedora
fedoraproject / fedora
gnu / glibc
netapp / bootstrap os
netapp / h300s
netapp / h300s firmware
netapp / h410c
netapp / h410c firmware
netapp / h410s
netapp / h410s firmware
netapp / h500s
netapp / h500s firmware
netapp / h700s
netapp / h700s firmware
netapp / hci compute node
netapp / ontap select deploy administration utility
redhat / codeready linux builder
redhat / codeready linux builder eus
redhat / codeready linux builder eus
redhat / codeready linux builder eus
redhat / codeready linux builder eus
redhat / codeready linux builder for arm64
redhat / codeready linux builder for arm64 eus
redhat / codeready linux builder for arm64 eus
redhat / codeready linux builder for arm64 eus
redhat / codeready linux builder for arm64 eus
redhat / codeready linux builder for ibm z systems
redhat / codeready linux builder for ibm z systems eus
redhat / codeready linux builder for ibm z systems eus
redhat / codeready linux builder for ibm z systems eus
redhat / codeready linux builder for ibm z systems eus
redhat / codeready linux builder for power little endian
redhat / codeready linux builder for power little endian eus
redhat / codeready linux builder for power little endian eus
redhat / codeready linux builder for power little endian eus
redhat / codeready linux builder for power little endian eus
redhat / enterprise linux
redhat / enterprise linux
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux for arm 64
redhat / enterprise linux for arm 64 eus
redhat / enterprise linux for arm 64 eus

and 33 more…

Certified products that may be affected

33 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
Red Hat Enterprise Linux 9 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5445 - active
Red Hat Enterprise Linux 9 libgcrypt - Red Hat, Inc. - FIPS 140 5366 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active

See all 33 in the Security Certifications Explorer.

References

http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html(Exploit, Third Party Advisory, VDB Entry)
http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html(Exploit, Third Party Advisory, VDB Entry)
http://seclists.org/fulldisclosure/2023/Oct/11(Exploit, Mailing List, Third Party Advisory)
http://www.openwall.com/lists/oss-security/2023/10/03/2(Exploit, Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/03/3(Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/05/1(Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/13/11(Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/14/3(Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/14/5(Mailing List)
http://www.openwall.com/lists/oss-security/2023/10/14/6(Mailing List)
https://access.redhat.com/errata/RHSA-2023:5453(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2023:5454(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2023:5455(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2023:5476(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2024:0033(Third Party Advisory)
https://access.redhat.com/security/cve/CVE-2023-4911(Third Party Advisory)
https://bugzilla.redhat.com/show_bug.cgi?id=2238352(Issue Tracking, Patch)
https://cert-portal.siemens.com/productcert/html/ssa-082556.html(Third Party Advisory)
https://cert-portal.siemens.com/productcert/html/ssa-794697.html(Third Party Advisory)
https://cert-portal.siemens.com/productcert/html/ssa-831302.html(Third Party Advisory)
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/(Mailing List)
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/(Mailing List)
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/(Mailing List)
https://security.gentoo.org/glsa/202310-03(Third Party Advisory)
https://security.netapp.com/advisory/ntap-20231013-0006/(Third Party Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4911(US Government Resource)
https://www.debian.org/security/2023/dsa-5514(Mailing List)
https://www.exploit-db.com/exploits/52479(Exploit, Third Party Advisory, VDB Entry)
https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt(Exploit, Third Party Advisory)
https://www.qualys.com/cve-2023-4911/(Third Party Advisory)

Last updated October 15, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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