CVE-2026-63550
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductMz Automation Gmbh Libiec61850
PublishedJul 30, 2026
First seenJul 30, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- MZ Automation GmbH libiec618501.6.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| MZ Automation GmbH libiec61850 | v < 1.6.2 | 1.6.2 |
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