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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…

High7.1EPSS 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.

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 (2 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial

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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.

Record last updated .