MZ Automation lib60870 Out-of-bounds Read
Priority HIGH 70CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · None · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
A crafted IEC 60870-5-104 I-frame with a declared object count exceeding what fits in the ASDU body causes InformationObject_ParseObjectAddress to read one byte past the end of the heap-allocated message buffer.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00458 39th percentileScored 2026-11-07
Fix Fixed lib60870 (MZ Automation): 2.4.1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MZ Automation | lib60870 | 2.4.0 | 2.4.1 | Patch available | CNA |
- lib60870 VendorMZ Automation Affected 2.4.0 Fixed in 2.4.1 Patch available CNA
Remediation
- Fix · CNA lib60870 (MZ Automation) Fixed in 2.4.1
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63033
- 2026-10-03 Alias added: GHSA-gqw6-mwcf-3xwh
References
More MZ Automation vulnerabilities
- TI-2026-75355 Infinite loop and out-of-bounds read in libIEC61850 ACSE parsing CVSS 4.0HIGH 8.7
- TI-2026-75345 Remote NULL dereference in libIEC61850 MMS Read crashes servers CVSS 3.1HIGH 7.5
- TI-2026-75344 Remote information disclosure in libIEC61850 MMS file service CVSS 3.1HIGH 7.5
- TI-2024-18824 In mz-automation libiec61850 v1.4.0, a NULL Pointer Dereference was detected in the… CVSS 3.1HIGH 7.5
- TI-2022-05561 Infinite loop in MZ Automation libiec61850 CVSS 3.1HIGH 7.5
- TI-2026-44285 MZ Automation lib60870 Out-of-bounds Read CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-63033 · CVE Program
- CVE-2026-63033 · NVD
- FIRST EPSS
- GHSA-gqw6-mwcf-3xwh · GitHub Advisory Database · CC BY 4.0
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