CVE-2021-30640

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.

How to fix CVE-2021-30640

To remediate CVE-2021-30640, upgrade the affected package to a fixed version below.

• —upgrade to 7.0.109 or later
• —upgrade to 8.5.54-0+deb9u7 or later
• —upgrade to 9.0.43-2~deb11u1 or later
• —upgrade to 9.0.31-1~deb10u5 or later
• —upgrade to 10.0.5 or later

Is CVE-2021-30640 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (5)

• >= 7.0.0, < 7.0.109, >= 8.5.0, < 8.5.66, >= 9.0.0, < 9.0.46, >= 10.0.0, < 10.0.6
• from 0, < 8.5.54-0+deb9u7
• from 0, < 9.0.43-2~deb11u1
• from 0, < 9.0.31-1~deb10u5
• >= 10.0.0-M1, < 10.0.5

CVSS scores

References (12)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-30640
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-30640
• WEBlists.apache.org/thread.html/r59f9ef03929d32120f91f4ea7e6e79edd5688d75d0a9b65fd26d1fe8%40%3Cannounce.tomcat.apache.org%3E
• WEBlists.debian.org/debian-lts-announce/2021/08/msg00009.html