Is CVE-2021-30640 in the CISA KEV catalog?

No. CVE-2021-30640 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30640?

CVE-2021-30640 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-30640?

CVE-2021-30640 has an EPSS score of 9.89% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30640?

Upgrade tomcat9 on debian 11 to 9.0.43-2~deb11u1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-30640

MEDIUMEPSS 95th pctl

6.5

CVSS v3

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.

CWE-116

How to fix

Remediation Available

tomcat9Debian

Fixed in:9.0.43-2~deb11u1CVE-2021-30640

Fixed in:9.0.43-2CVE-2021-30640

libtomcat9-embed-javaUbuntu

Fixed in:9.0.16-3ubuntu0.18.04.2USN-5360-1

Fixed in:9.0.31-1ubuntu0.2USN-5360-1

libtomcat9-javaUbuntu

Fixed in:9.0.16-3ubuntu0.18.04.2USN-5360-1

Fixed in:9.0.31-1ubuntu0.2USN-5360-1

tomcat9Ubuntu

Fixed in:9.0.16-3ubuntu0.18.04.2USN-5360-1

Fixed in:9.0.31-1ubuntu0.2USN-5360-1

tomcat9-commonUbuntu

Fixed in:9.0.16-3ubuntu0.18.04.2USN-5360-1

Fixed in:9.0.31-1ubuntu0.2USN-5360-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

9.89%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch2

Vendor Advisory1

lists.apache.org

Third-Party Advisory6

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.