CVE-2026-63550: CWE-125 in MZ Automation GmbH libiec61850
CVE-2026-63550 is a medium severity vulnerability in MZ Automation GmbH's libiec61850 library. It involves a boundary-handling flaw in the MMS BER decoder when processing certain confirmed-request messages. A crafted BER-encoded element can cause the decoder to read beyond heap boundaries, leading to a denial-of-service by terminating the MMS handling process unexpectedly.
AI Analysis
Technical Summary
The MMS BER decoder in libiec61850 contains a boundary-handling flaw (CWE-125) in processing specific fields within confirmed-request messages. When a specially crafted BER-encoded element is received over an established MMS session on TCP port 102, the decoder may incorrectly advance its internal read position, causing a heap out-of-bounds read. This results in the MMS handling process crashing and a denial-of-service condition.
Potential Impact
This vulnerability causes a denial-of-service (DoS) by crashing the MMS handling process due to a heap out-of-bounds read. There is no impact on confidentiality or integrity reported. The CVSS 3.1 base score is 6.5 (medium), reflecting network attack vector, low attack complexity, requiring low privileges, no user interaction, and impact limited to availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented at this time.
CVE-2026-63550: CWE-125 in MZ Automation GmbH libiec61850
Description
CVE-2026-63550 is a medium severity vulnerability in MZ Automation GmbH's libiec61850 library. It involves a boundary-handling flaw in the MMS BER decoder when processing certain confirmed-request messages. A crafted BER-encoded element can cause the decoder to read beyond heap boundaries, leading to a denial-of-service by terminating the MMS handling process unexpectedly.
CVSS v3.1
Score 6.5medium
Affected software
MZ Automation GmbH
libiec61850
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The MMS BER decoder in libiec61850 contains a boundary-handling flaw (CWE-125) in processing specific fields within confirmed-request messages. When a specially crafted BER-encoded element is received over an established MMS session on TCP port 102, the decoder may incorrectly advance its internal read position, causing a heap out-of-bounds read. This results in the MMS handling process crashing and a denial-of-service condition.
Potential Impact
This vulnerability causes a denial-of-service (DoS) by crashing the MMS handling process due to a heap out-of-bounds read. There is no impact on confidentiality or integrity reported. The CVSS 3.1 base score is 6.5 (medium), reflecting network attack vector, low attack complexity, requiring low privileges, no user interaction, and impact limited to availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary mitigation has been documented at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-07-27T19:32:49.393Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a6bdccd9c2644c7f8d9d037
Added to database: 07/30/2026, 23:22:53 UTC
Last enriched: 08/07/2026, 14:51:10 UTC
Last updated: 09/13/2026, 22:01:36 UTC
Views: 60
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