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Vulnerabilities

Vulnerability · CVE-2017-5651

In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the refactoring of the HTTP connectors introduced a regression in the send file processing.

Published Apr 17, 2017 · catalog updated Jun 17, 2026 · In Apache Tomcat 9.0.0.M1

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2017-5651. EPSS is 7.75%. Act only if a listed version of In Apache Tomcat 9.0.0.M1 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In Apache Tomcat 9.0.0.M1).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
7.75%
Remediation
Advisory link
Affected products
cpe apache/tomcat

In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the refactoring of the HTTP connectors introduced a regression in the send file processing. If the send file processing completed quickly, it was possible for the Processor to be added to the processor cache twice. This could result in the same Processor being used for multiple requests which in turn could lead to unexpected errors and/or response mix-up.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe apache/tomcat8.5.0
  • cpe apache/tomcat8.5.1
  • cpe apache/tomcat8.5.2
  • cpe apache/tomcat8.5.3
  • cpe apache/tomcat8.5.4
  • cpe apache/tomcat8.5.5

How to fix CVE-2017-5651

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2017-5651. EPSS is 7.75%. Act only if a listed version of In Apache Tomcat 9.0.0.M1 is installed.

Which versions are affected?

Compare what you have installed with 8.5.0, 8.5.1, 8.5.2, 8.5.3, 8.5.4, 8.5.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 7.75%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Apache Tomcat security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 17, 2017 · Monitored products — critical

    Detected

    In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the refactoring of the HTTP connectors introduced a regression in the send file processing. If the send file processing completed quickly, it was possible for the Processor to be added to the processor cache twice. This could result in the same Processor being used for multiple requests which in turn could lead to unexpected errors and/or

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the refactoring of the HTTP connectors introduced a regression in the send file processing. If the send file processing completed quickly, it was possible for the Processor to be added to the processor cache twice. This could result in the same Processor being used for multiple requests which in turn could lead to unexpected errors and/or

Sources

  • CVE.orgVulnerability recordCVE-2017-5651

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2017-5651

    30-day exploitation probability 7.75%

    first.org
  • Monitored products — criticalVendor advisoryCVE-2017-5651

    In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the refactoring of the HTTP connectors introduced a regression in the send file processing. If the send file processing completed quickly, it was possible for the Processor to be added to the processor cache twice. This could result in the same Processor being used for multiple requests which in turn could lead to unexpected errors and/or

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 3, 2026