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 to 10.0.5; 9.0.0 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?

Moderate — EPSS is 9.9%. Track this CVE but it's not at the top of the prioritisation list.

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

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM6.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N