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CVE-2023-4911

7.8, high Known exploited

GNU C Library Buffer Overflow Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.8, high high CVSS v3.1
EPSS, next 30 days
64% higher than 99.2% of scored CVEs
Exploitation
Confirmed in the wild
Published
3 Oct 20233 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 21 Nov 2023. US federal agencies had to remediate by 12 Dec 2023, a deadline that has passed.

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.

Details

Vendor
GNU and 1 more
Product
Red Hat Enterprise Linux 8
Weakness
CWE-122 (opens in a new tab)
Status
Analyzed
Updated
14 Oct 2026
Assigner
secalert@redhat.com

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References 30

Exploit code 6

Patches and fixes 1

Advisories 19

11 more

Other references 4

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other GNU CVEs

Every GNU CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-24061 GNU InetUtils Argument Injection Vulnerability KEV EPSS 99% 9.8, critical
  • CVE-2014-6278 GNU Bash OS Command Injection Vulnerability KEV EPSS 100% 8.8, high
  • CVE-2014-7169 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2014-6271 GNU Bourne-Again Shell (Bash) Arbitrary Code Execution Vulnerability KEV EPSS 100% 9.8, critical

Beyond this page

Is CVE-2023-4911 in your network?

This page tells you how dangerous CVE-2023-4911 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2023-4911 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-4911 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.