CVE-2021-3688

Name: CVE-2021-3688
Creator: NVD / NIST
Published: 2022-08-26T16:15:09.33+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.46%

Last modified Jun 17, 2026

CVE-2021-3688 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. 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. EPSS estimates a 0.46% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.46%

36.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Jboss Core Services Httpd	< 2.4.37
Redhat	Jboss Core Services Httpd	2.4.37

References

https://access.redhat.com/security/cve/CVE-2021-3688Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1990252Issue Tracking, Vendor Advisory
https://access.redhat.com/security/cve/CVE-2021-3688Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1990252Issue Tracking, Vendor Advisory

Timeline

Published: Aug 26, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3688?

How severe is CVE-2021-3688?

CVE-2021-3688 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3688?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3688?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST