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Vulnerability record · CVE-2021-30640 · published 12 July 2021

CVE-2021-30640: Apache tomcat vulnerability

Apache · Tomcat

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.

6.5 CVSS 3.1 Medium EPSS 9.9% · top 4.6% CWE-116 · CWE-116
6.5CVSS 3.1 base score, v2 5.8
9.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

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.

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

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apac Mailing ListVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html Mailing ListThird 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 PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://lists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apac Mailing ListVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00009.html Mailing ListThird 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 PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory

Track CVE-2021-30640 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-30640), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.