Information disclosure in Apache Tomcat

Published: 2022-09-28
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-43980
Exploitation vector Network
Public exploit N/A
Vulnerable software
Apache Tomcat
Server applications / Web servers

Vendor Apache Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU67714

Risk: Low


CVE-ID: CVE-2021-43980

CWE-ID: CWE-200 - Information Exposure

Exploit availability: No


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to incorrect implementation of blocking reads and writes. A remote attacker can trigger a concurrency bug and force client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client.


Install updates from vendor's website.

Vulnerable software versions

Apache Tomcat: 10.1.0-M1 - 10.1.0-M12, 10.0.0 - 10.0.18, 9.0.0 - 9.0.60, 8.5.0 - 8.5.77

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?