CVE-2026-63550

Description

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.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4