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-2021-30640

CVE-2021-30640MEDIUM

Apache Software Foundation Apache Tomcat — Auth weakness in JNDIRealm

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   N  U  L  H  N    6.5   .0989   95.5     —

AFFECTED
  Product        Versions                                Fixed
  Apache Tomcat  Apache Tomcat 10 10.0.0-M1 to 10.0.5 –  —

TIMELINE
  Apr 13  Reserved by apache
  Jul 12  Published (CNA: apache)
  Oct 8   ENRICHED — CVE-2021-30640 (Apache Software Foundation Apache Tomcat). Received CVSS 6.5 and CPE data from NVD.

CWE-116 · CNA: apache · CVSS v3.1 · 9 references · NVD status: Modified

Description

A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 13, 2021	Reserved	Reserved by apache
July 12, 2021	Published	Published (CNA: apache)
October 8, 2026	ENRICHED	ENRICHED — CVE-2021-30640 (Apache Software Foundation Apache Tomcat). Received CVSS 6.5 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Apache Software Foundation	Apache Tomcat	—	Apache Tomcat 10 10.0.0-M1 to 10.0.5	—

Weaknesses

CWE-116

References (9)

https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3E [Mailing List, Vendor Advisory]
https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html [Mailing List, Third Party Advisory]
https://security.gentoo.org/glsa/202208-34 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20210827-0007/ [Third Party Advisory]
https://www.debian.org/security/2021/dsa-4952 [Third Party Advisory]
https://www.debian.org/security/2021/dsa-4986 [Third Party Advisory]
https://www.oracle.com//security-alerts/cpujul2021.html [Third Party Advisory]
https://www.oracle.com/security-alerts/cpujan2022.html [Patch, Third Party Advisory]
https://www.oracle.com/security-alerts/cpuoct2021.html [Patch, Third Party Advisory]

Authoritative record: CVE-2021-30640 at cve.org

Vendors: apache

Weaknesses: CWE-116

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-30640 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.