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CVE-2021-3688

JBCS: URL normalization issue with dot-dot-semicolon(s) leads to information disclosure

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Severity

Moderate

Red Hat Product Security

4.8

CVSS 3.1

Review impact separately from score.

Published · August 5, 2021

Updated · September 21, 2026

Description

A flaw was found in Red Hat JBoss Core Services HTTP Server in all versions, where it does not properly normalize the path component of a request URL contains dot-dot-semicolon(s). This flaw could allow an attacker to access unauthorized information or possibly conduct further attacks. The highest threat from this vulnerability is to data confidentiality and integrity.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Manually add LocationMatch directive to deny any possible problem requests in the JBCS httpd configuration. For example:

<LocationMatch ".*\.\.;.*">
  Require all denied
</LocationMatch>

CVSS / CWE

CVSS 3.1 · 4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor