Threat Intelligence / CVE / CVE-2023-4911

CVE-2023-4911 — Red Hat Enterprise Linux 8

CISA KEV
CVSS v3.1 7.8 (HIGH) · EPSS 81.4% (higher than 99.6% of all scored CVEs) · Priority 9/10 · Published 2023-10-03

As of 2026-07-14, CVE-2023-4911 is a HIGH-severity vulnerability in Red Hat Enterprise Linux 8, CVSS v3.1 7.8, EPSS 81.4% (99.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-11-21), with a US federal remediation deadline of 2023-12-12. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2023-4911, most recently “EtherHiding: Blockchain-Based C2 on Polygon Fuels ClickFix Backdoor + Banking-Trojan Extension Campaign Adopted by Criminal, North Korean, and Iran-Linked Actors”.

Last updated: 2026-07-14

What is CVE-2023-4911?

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.

The record classifies CVE-2023-4911 under weakness class CWE-122. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 7 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1085 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
81.4% probability of exploitation in the next 30 days, higher than 99.6% of all scored CVEs
CISA KEV
Listed since 2023-11-21, federal remediation deadline 2023-12-12
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2023-10-03, last modified 2026-07-14

Is CVE-2023-4911 being exploited?

CISA added CVE-2023-4911 to the Known Exploited Vulnerabilities catalog on 2023-11-21, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-12-12 under BOD 22-01. Weaponised exploit code for CVE-2023-4911 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2023-4911

Because CVE-2023-4911 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-12-12. No vendor patch reference has been recorded for CVE-2023-4911 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2023-4911

1 tracked threat in the Threadlinqs corpus references CVE-2023-4911, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .

Vendor advisory and patch

Third-party advisory

Other references

Full detection coverage & IOCs for threats exploiting CVE-2023-4911 are available via the Threadlinqs MCP server (Purple tier). View plans →

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