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CVE-2020-17527

HighPublished

Apache Tomcat: Request header mix-up between HTTP/2 streams

Published: Dec 3, 2020
Updated: Feb 13, 2025
Assigning CNA: apache
Evidence observed: Aug 8, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

24.6%

Moderate · next 30 days

Percentile: 97.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.

Sources

CVE-2020-17527-TomcatExploit
Exploit for CVE-2020-17527 in Apache Tomcat, enabling remote code execution via HTTP/2 request smuggling. Designed for penetration testing and vulnerability validation.

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