CVE-2026-18583

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 40.2% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-12.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-03 04:15Z1 MO AGO

Last updated

2026-08-03 19:58Z1 MO AGO

Reserved

2026-08-02

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

bcd1d80f1174bfdf3d2dc0eb37480e9e9440bb97ffae0d5a5da72adfc84be8cb

• vuldb.comVDB-385412 | mz-automation libiec61850 MMS Request mms_mapping.c checkDataSetAccess out-of-boundshttps://vuldb.com/vuln/385412vdb-entrytechnical-description
• vuldb.comVDB-385412 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/385412/ctisignaturepermissions-required
• vuldb.comCVE-2026-18583 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-18583third-party-advisory
• vuldb.comSubmit #844921 | MZ Automation GmbH libiec61850 1.6.1 Out-of-bounds Readhttps://vuldb.com/submit/844921third-party-advisory
• github.comhttps://github.com/mz-automation/libiec61850/security/advisories/GHSA-7v2x-39mw-2979related
• github.comhttps://github.com/gff-cw/information/issues/3exploitissue-tracking
• github.comhttps://github.com/mz-automation/libiec61850/commit/062062daf4cb50c7aa76e01d6fb4d58fc9278a7dpatch
• github.comhttps://github.com/mz-automation/libiec61850/releases/tag/v1.6.2patch
• github.comhttps://github.com/mz-automation/libiec61850/product