CVE-2026-65421

MEDIUM

The MMS BER decoder contains a flaw in decoding fixed-width BER fields (boolean/integer): an attacker-supplied length value is not validated, causing a read past the end of a heap buffer. This leads to termination of the MMS service process and a denial-of-service condition.

CVSS v3.1 Score

6.5
MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 7/30/2026Modified: 7/31/2026

Related Intelligence (1)

CRITICALPhishing

MZ Automation GmbH libiec61850

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Successful exploitation of these vulnerabilities could allow an attacker to cause a denial-of-service condition on the device.</strong></p> <p>The following versions of MZ Automation GmbH libiec61850 are affected:</p> <ul> <li>libiec6

CVE-2026-66720CVE-2026-66369
CISA Advisories

References (2)

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.jsonhttps://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10