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CVE-2026-66349

6.5 · MEDIUM

The MMS server connection handler contains a flaw in its processing of BER-encoded request data.

Published Jul 30, 2026CWE-125EPSS 0.29%

Overview

CVE-2026-66349 is a medium-severity vulnerability. It was published on July 30, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The MMS server connection handler contains a flaw in its processing of

BER-encoded request data. When an MMS confirmed request PDU containing

an extended BER tag is received over an established session, the decoder

may advance its internal buffer incorrectly due to a missing bounds

check. This results in a one byte heap out-of-bounds read and causes the

MMS service process to terminate, leading to a denial-of-service

condition.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.jsonCISAwww.cisa.gov/news-events/ics-advisories/icsa-26-211-10

How CyberStrike helps

Frequently asked questions

What is CVE-2026-66349?

CVE-2026-66349 is a medium-severity vulnerability. It was published on July 30, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-66349?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-66349?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66349?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-66349 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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