What’s Vulnerable › Vulnerabilities

CVE-2023-34981: Apache Tomcat: AJP response header mix-up

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-06-21 · updated 2026-06-17
• Weakness: CWE-732

Description

A regression in the fix for bug 66512 in Apache Tomcat 11.0.0-M5, 10.1.8, 9.0.74 and 8.5.88 meant that, if a response did not include any HTTP headers no AJP SEND_HEADERS messare woudl be sent for the response which in turn meant that at least one AJP proxy (mod_proxy_ajp) would use the response headers from the previous request leading to an information leak.

Affected products

• Apache Tomcat: 8.5.88, 9.0.74, 10.1.8, 11.0.0-milestone5

References

• https://lists.apache.org/thread/j1ksjh9m9gx1q60rtk1sbzmxhvj5h5qz
• https://security.netapp.com/advisory/ntap-20230714-0003/
• https://lists.apache.org/thread/j1ksjh9m9gx1q60rtk1sbzmxhvj5h5qz
• https://security.netapp.com/advisory/ntap-20230714-0003/

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