Known Exploited Vulnerability

CVE-2023-4911

GNU C Library Buffer Overflow Vulnerability

Past federal due date 99 public exploits Added 21 Nov 2023 Due 12 Dec 2023 · 964 days ago

VendorGNU

ProductGNU C Library

WeaknessCWE-122

RansomwareNone confirmed

What the flaw is

GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.

Description as published by CISA. We have not independently reproduced it.

What CISA requires

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

This deadline is binding on US federal civilian agencies under BOD 22-01. It is not a legal deadline for anyone else, but it is a useful urgency signal — CISA sets it by how actively the flaw is being used, not by CVSS.

Public exploit code

99 public repositories referencing this CVE have been catalogued on GitHub. That volume usually means a reliable, widely-reproduced exploit. Treat this as a strong signal to prioritise patching, not as a verified working exploit — many such repositories are scanners, write-ups or forks rather than functional code.

Showing 8 of 99. Full list in the trickest/cve dataset.

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Other GNU entries

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CVE-2026-24061

Source: CISA KEV catalog · last verified July 31, 2026. Rebuilt automatically twice a day.