CVE-2026-67873

criticalCVSS 9.8covered by 1 sourcefirst seen 2026-08-06

A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU encoding path. The issue occurs because FileSegment_encode() validates only the standalone segment length via FileSegment_GetMaxDataSize() and does not verify the residual capacity of the current ASDU frame before encoding object fields and segment data

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Exploitation outlook

Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-67873: A heap-based buffer overflow exists in lib60870-C 2.4.0 in the server-side FileSegment ASDU en…nvd · 2026-08-06

External references

NVD record for CVE-2026-67873

CVE.org record

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