CVE-2026-66349
6.5
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MZ Automation GmbH | libiec61850 | 0 < 1.6.2 | affected |
| MZ Automation GmbH | libiec61850 | 1.6.2 | unaffected |
Weaknesses
- CWE-125: CWE-125
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
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