PT-2026-66632 · Mz Automation Gmbh · Libiec61850

Arun Babu · CVE-2026-63550 · Published 2026-07-30 · Updated 2026-07-30

NVD

CVSS v3.1

6.5

Medium

Base vector

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

The MMS BER decoder contains a boundary-handling flaw in the processing of certain fields within confirmed-request messages. When a crafted BER-encoded element is received over an established MMS session (TCP port 102), the decoder may advance its internal read position incorrectly, leading to a heap out-of-bounds read. This condition causes the MMS handling process to terminate unexpectedly, resulting in a denial-of-service.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-63550

Affected Products

Libiec61850

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-63550 · Security Note
• https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json · Note
• https://cisa.gov/news-events/ics-advisories/icsa-26-211-10 · Note