Vulnerability details
CVE-2026-66360
MZ Automation libiec61850
MZ Automation libiec61850 Out-of-bounds Read
CVSS 4.0
8.7High
Official description
The ISO Presentation layer contains a flaw in the handling of specific parameters during normal mode negotiation. A missing length check in the processing of the encoded presentation data allows an attacker controlled field with a zero length value to trigger a bounded heap over read. This condition occurs before MMS session establishment, a crafted TCP/102 connection attempt can trigger the issue. The resulting over read causes the process to terminate, leading to a denial of service condition.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (icscert) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (icscert) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| MZ Automation GmbH | libiec61850 | v < 1.6.2 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-07-31
- Last updated
- 2026-07-31
- State
- Published
- Assigner (CNA)
- icscert
Exploit prediction (EPSS)
0.48%
Probability of exploitation in 30 days
42.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-125