Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-3541

CVE-2021-3541MEDIUM

n/a libxml2 — A flaw was found in libxml2.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  H    6.5   .0207   81.1     —

AFFECTED
  Product  Versions  Fixed
  libxml2  2.9.11 –  —

TIMELINE
  May 10  Reserved by redhat
  Jul 9   Published (CNA: redhat)
  Oct 14  ENRICHED — CVE-2021-3541 (libxml2). Received CVSS 6.5 and CPE data from NVD.

CWE-776 · CNA: redhat · CVSS v3.1 · 4 references · NVD status: Modified

Description

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 10, 2021	Reserved	Reserved by redhat
July 9, 2021	Published	Published (CNA: redhat)
October 14, 2026	ENRICHED	ENRICHED — CVE-2021-3541 (libxml2). Received CVSS 6.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	libxml2	—	2.9.11	—

Weaknesses

CWE-776

References (4)

https://bugzilla.redhat.com/show_bug.cgi?id=1950515 [Issue Tracking, Patch, Third Party Advisory]
https://cert-portal.siemens.com/productcert/html/ssa-398330.html
https://security.netapp.com/advisory/ntap-20210805-0007/ [Third Party Advisory]
https://www.oracle.com/security-alerts/cpujan2022.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-3541 at cve.org

Weaknesses: CWE-776

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-3541 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.