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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…

High7.1Public exploitEPSS 39.6%
Published
Updated
Reserved
Assigned by
apache

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.

Public exploit

A reference of the record is tagged as an exploit or proof of concept: anyone can try it against an unpatched system.

Timeline

  1. ID reserved

    By apache

  2. · 7 months later

    Published

  3. · 8 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2016-6816, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0High7.1CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS (exploitation in 30 days)
39.6% · top 1.4% of all CVEs (8 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

Affected products

  • Apache Software Foundation · Apache Tomcat

    • affected 9.0.0.M1 to 9.0.0.M11
    • affected 8.5.0 to 8.5.6
    • affected 8.0.0.RC1 to 8.0.38
    • affected 7.0.0 to 7.0.72
    • affected 6.0.0 to 6.0.47
    • affected Earlier, unsupported versions may also be affected.

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References (36)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2016-6816 badge
[![CVE-2016-6816](https://cveledger.app/badge/CVE-2016-6816.svg)](https://cveledger.app/cve/CVE-2016-6816)

Record last updated .