EUVD-2026-53677
GHSA-vgf8-x653-r7r2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable and unauthenticated per protocol, but reached only via the server file-transfer encoding path under specific segment sizing, so AC:H; heap corruption yields potential code execution, hence C/I/A High.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
5DescriptionCVE.org
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
AnalysisAI
Heap-based buffer overflow in lib60870-C 2.4.0 affects the server-side FileSegment ASDU encoding path, where FileSegment_encode() checks only the standalone segment length via FileSegment_GetMaxDataSize() but never verifies remaining capacity in the current ASDU frame before writing object fields and segment data. In IEC 60870-5-101/104 telecontrol servers using the library's file transfer functionality, this out-of-bounds heap write can corrupt memory, enabling denial of service and potentially remote code execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be running lib60870-C 2.4.0 acting as a server with the IEC 60870-5 file transfer feature in use, since the flaw is in the server-side FileSegment ASDU encoding path (FileSegment_encode()) and is only reached when the server encodes a file segment into an ASDU frame whose residual capacity is exceeded. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, 9.8 Critical) treats this as remotely and trivially exploitable with full CIA impact, consistent with a memory-corruption bug that can lead to code execution on a network-facing ICS server. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis - version 2.4.0 is the current tagged release and is the affected version, and its release notes (secure-authentication integration, improved interrogation handling, IEC 62351-3 compliance) do not reference a fix for issue #201, so a fixed release version cannot be independently confirmed; monitor https://github.com/mz-automation/lib60870/issues/201 and the releases page for an upstream fix and rebuild once available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: conduct asset inventory to identify all systems and applications running lib60870-C 2.4.0 or earlier versions, and network-segment or isolate affected servers from untrusted network access. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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