CVE-2023-41104

Name: CVE-2023-41104
Creator: NVD / NIST
Published: 2023-08-23T07:15:08.417+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2023-41104 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

libvmod-digest before 1.0.3, as used in Varnish Enterprise 6.0.x before 6.0.11r5, has an out-of-bounds memory access during base64 decoding, leading to both authentication bypass and information disclosure; however, the exact attack surface will depend on the particular VCL (Varnish Configuration Language) configuration in use.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.49%

38.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Varnish-Software	Varnish Enterprise	>= 6.0.0, < 6.0.11
Varnish-Software	Varnish Enterprise	6.0.11
Varnish-Software	Vmod Digest	< 1.0.3

References

https://docs.varnish-software.com/security/VSV00012/Mitigation, Vendor Advisory
https://github.com/varnish/libvmod-digest/releases/tag/libvmod-digest-1.0.3Release Notes
https://www.varnish-cache.org/security/VSV00012.htmlPatch, Vendor Advisory
https://docs.varnish-software.com/security/VSV00012/Mitigation, Vendor Advisory
https://github.com/varnish/libvmod-digest/releases/tag/libvmod-digest-1.0.3Release Notes
https://www.varnish-cache.org/security/VSV00012.htmlPatch, Vendor Advisory

Timeline

Published: Aug 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-41104?

How severe is CVE-2023-41104?

CVE-2023-41104 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2023-41104?

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-2023-41104?

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

Scan your code now

Source: NVD / NIST