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CVE-2023-4911

High 7.8 Exploited in the wild (KEV)

Confirmed active exploitation — CISA KEV catalog

Name
GNU C Library Buffer Overflow Vulnerability
Added to catalog
Remediation due date (US federal)
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Description

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.

Metrics

CVSS 3.1
7.8 (HIGH) Score source: NVD CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — exploit probability
64% (percentile: 99) as of 2 November 2026
CWE
CWE-122, CWE-787

Affected products

netapp: bootstrap os; netapp: hci compute node; siemens: simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware; siemens: simatic s7-1500 cpu 1518-4 pn\/dp mfp; siemens: simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware; siemens: simatic s7-1500 cpu 1518f-4 pn\/dp mfp; siemens: siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware; siemens: siplus s7-1500 cpu 1518-4 pn\/dp mfp; siemens: simatic s7-1500 tm mfp firmware; siemens: simatic s7-1500 tm mfp; gnu: glibc; fedoraproject: fedora; redhat: codeready linux builder; redhat: codeready linux builder eus; redhat: codeready linux builder for arm64

References