Improper Handling of Exceptional Conditions in Apache Tomcat - CVE-2021-30639

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Main Vulnerability Database Vulnerabilities #VU55422

Improper Handling of Exceptional Conditions in Apache Tomcat - CVE-2021-30639

Published: July 29, 2021


Vulnerability identifier: #VU55422
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-30639
CWE-ID: CWE-755
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper error management within the application when handling unexpected connection termination. A remote attacker can drop connection with the Apache Tomcat server, which triggers a non-blocking I/O error and causes all requests, handled by that request object, to fail. As a result, a remote attacker can initiate and drop connections to the server and perform a denial of service attack.

Affected software

Apache Tomcat
Gentoo Linux
Big Data Spatial and Graph
Traffix SDC
IBM App Connect Professional
IBM UrbanCode Release
Siebel Apps - Marketing
Tomcat
Dell EMC Unity Operating Environment (OE)
Dell EMC Unity XT Operating Environment (OE)
Dell EMC Unity VSA Operating Environment (OE)

How to mitigate CVE-2021-30639

Install updates from vendor's website.

Apache Tomcat - addressed in versions 8.5.65, 9.0.45, 10.0.5
IBM UrbanCode Release - update to 6.2.5.5
Tomcat - update to D.9.0.87.01
Dell EMC Unity Operating Environment (OE) - update to 5.2.0.0.5.173
Dell EMC Unity XT Operating Environment (OE) - update to 5.2.0.0.5.173
Dell EMC Unity VSA Operating Environment (OE) - update to 5.2.0.0.5.173

External References

Related Security Bulletins