Is CVE-2023-4911 actively exploited?

Yes. KEV Intelligence tracks CVE-2023-4911 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2023-4911. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2023-4911 affects , Red Hat Red Hat Enterprise Linux 8 and 6 other products. KEV Intelligence lists 18 version rows; examples include V3.1.5 to < *.

Yes. CVE-2023-4911 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

CVE-2023-4911 Exploited in the Wild — , Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Virtualization 4 for Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7

Q: How should organizations remediate it?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Q: Is it in CISA KEV?

Yes. CVE-2023-4911 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-4911 is Glibc: buffer overflow in ld.so leading to privilege escalation affecting , Red Hat Red Hat Enterprise Linux 8 and 6 other products. A buffer overflow was discovered in the GNU C Library's dynamic...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

, Red Hat / Red Hat Enterprise Linux 8 affected before *.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Glibc: buffer overflow in ld.so leading to privilege escalation

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.

Vendor Product Affected Status

Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Before * Affected

Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Before * Affected

Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Before * Affected

— — glibc Before 2.39 Affected

Red Hat Red Hat Enterprise Linux 8 glibc Before * Unaffected

Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support glibc Before * Unaffected

Red Hat Red Hat Enterprise Linux 9 glibc Before * Unaffected

Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support glibc Before * Unaffected

Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 glibc Before * Unaffected

Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 redhat-release-virtualization-host Before * Unaffected

Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 redhat-virtualization-host Before * Unaffected

Red Hat Red Hat Enterprise Linux 6 glibc All versions (default: unaffected) Unaffected

Red Hat Red Hat Enterprise Linux 7 compat-glibc All versions (default: unaffected) Unaffected

Red Hat Red Hat Enterprise Linux 7 glibc All versions (default: unaffected) Unaffected

View vendor advisory

Published: 03 Oct 2023
Exploitation Reported: 21 Nov 2023
Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2023-4911
RHSA-2023:5453 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2023:5453
RHSA-2023:5454 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2023:5454
RHSA-2023:5455 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2023:5455
RHSA-2023:5476 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2023:5476
RHSA-2024:0033 access.redhat.com · Vendor Advisory https://access.redhat.com/errata/RHSA-2024:0033
RHBZ#2238352 bugzilla.redhat.com · Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2238352
VDB Entry — access.redhat.com access.redhat.com · VDB Entry https://access.redhat.com/security/cve/CVE-2023-4911
qualys.com/2023/10/03/cve-2023-4911/looney-tunables-loc... qualys.com · CVE Record https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local...
qualys.com/cve-2023-4911 qualys.com · CVE Record https://www.qualys.com/cve-2023-4911/

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 21 Nov 2023

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

GitHub

Recorded 04 Oct 2023

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
CISA First	2023-11-21 00:00 UTC
CVE	2026-06-05 09:28 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Metasploit template detected 28 Apr 2025.

View Metasploit template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/glibc_tunables_priv_esc.rb	28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

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

EPSS

81.4%

Weaknesses

Heap-based Buffer Overflow CWE-122

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

glibc_tunables_priv_esc

metasploit · Created Unknown

Metasploit module for CVE-2023-4911

Timeline

From disclosure to observed exploitation

05 Jun 2026
KEV confirmed by CVE

Exploitation attested by an external source
28 Apr 2025
Metasploit module available

Exploit module available
28 Apr 2025
Public PoC available

Public proof-of-concept code published
21 Nov 2023
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
03 Oct 2023
CVE published

Vulnerability disclosed publicly
12 Sep 2023
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

View Pro pricing Read API docs

Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2023-4911

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2023-4911",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.81422,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2023-4911