CVE-2021-30640

Name: CVE-2021-30640
Creator: NVD / NIST
Published: 2021-07-12T15:15:08.367+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 9.89%

Last modified Jun 17, 2026

CVE-2021-30640 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 9.89% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

9.89%

95.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-116

Affected Software

Vendor	Product	Versions
Apache	Tomcat	>= 7.0.0, < 7.0.109
Apache	Tomcat	>= 8.5.0, < 8.5.66
Apache	Tomcat	>= 9.0.0, < 9.0.46
Apache	Tomcat	>= 10.0.0, < 10.0.6
Oracle	Communications Cloud Native Core Policy	1.14.0
Oracle	Communications Diameter Signaling Router	>= 8.0.0, <= 8.5.0
Oracle	Communications Pricing Design Center	12.0.0.3.0
Oracle	Hospitality Cruise Shipboard Property Management System	20.1.0
Oracle	Tekelec Platform Distribution	>= 7.4.0, <= 7.7.1
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

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

Timeline

Published: Jul 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30640?

How severe is CVE-2021-30640?

CVE-2021-30640 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 9.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30640?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-30640?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST