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Vulnerabilities

Vulnerability · CVE-2005-4836

The HTTP/1.1 connector in Apache Tomcat 4.1.15 through 4.1.40 does not reject NULL bytes in a URL when allowLinking is configured, which allows remote attackers to rea…

Published Dec 31, 2005 · catalog updated Jun 16, 2026 · the affected product

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2005-4836. EPSS is 3.47%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
3.47%
Remediation
Advisory link
Affected products
cpe apache/tomcat

The HTTP/1.1 connector in Apache Tomcat 4.1.15 through 4.1.40 does not reject NULL bytes in a URL when allowLinking is configured, which allows remote attackers to read JSP source files and obtain sensitive information.

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/tomcat4.1.15
  • cpe apache/tomcat4.1.16
  • cpe apache/tomcat4.1.17
  • cpe apache/tomcat4.1.18
  • cpe apache/tomcat4.1.19
  • cpe apache/tomcat4.1.20

How to fix CVE-2005-4836

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-2005-4836. EPSS is 3.47%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with 4.1.15, 4.1.16, 4.1.17, 4.1.18, 4.1.19, 4.1.20. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 3.47%. 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. Dec 31, 2005 · Monitored products — critical

    Detected

    The HTTP/1.1 connector in Apache Tomcat 4.1.15 through 4.1.40 does not reject NULL bytes in a URL when allowLinking is configured, which allows remote attackers to read JSP source files and obtain sensitive information.

  2. Jun 16, 2026 · Monitored products — critical

    Updated

    The HTTP/1.1 connector in Apache Tomcat 4.1.15 through 4.1.40 does not reject NULL bytes in a URL when allowLinking is configured, which allows remote attackers to read JSP source files and obtain sensitive information.

Sources

  • FIRST EPSSExploitation probabilityCVE-2005-4836

    30-day exploitation probability 3.47%

    first.org
  • Monitored products — criticalVendor advisoryCVE-2005-4836

    The HTTP/1.1 connector in Apache Tomcat 4.1.15 through 4.1.40 does not reject NULL bytes in a URL when allowLinking is configured, which allows remote attackers to read JSP source files and obtain sensitive information.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • Monitored products — criticalNov 3, 2026