CVE-2017-7674 Insufficient Verification of Data Authenticity in Apache Tomcat

What is CVE-2017-7674?

CVE-2017-7674 is a medium-severity vulnerability in Apache Tomcat, published on 11 Aug 2017. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

The CORS Filter in Apache Tomcat 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44 and 7.0.41 to 7.0.78 did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances.

Weakness: CWE-345

Which versions are affected by CVE-2017-7674?

8 open source packages ship an affected version, including org.apache.tomcat:tomcat. It affects 1 product.

Products include Apache Tomcat.

How do I fix CVE-2017-7674?

Upgrade org.apache.tomcat:tomcat to a fixed version for your release line: 7.0.79, 8.0.45, 8.5.16 or 9.0.0.M22.

Is CVE-2017-7674 being exploited?

There is no known exploitation of CVE-2017-7674 in the wild and no public exploit code.

Other vulnerabilities in Apache Tomcat

• CVE-2025-24813 Apache Tomcat Path Equivalence Exploited Critical 10.0
• CVE-2016-8735 Apache Tomcat Remote Code Execution Exploited Critical 9.8
• CVE-2017-12617 Apache Tomcat Remote Code Execution Exploited High 8.1
• CVE-2017-12615 Apache Tomcat on Windows Remote Code Execution Exploited High 8.1
• CVE-2026-34486 Apache Tomcat Missing Encryption of Sensitive Data Exploited High 7.5

All Apache Tomcat vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DSA-3974-1, GHSA-73rx-3f9r-x949, UBUNTU-CVE-2017-7674.