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TI-2026-70125 Aliases CVE-2026-75352GHSA-fgff-hw4c-vx3q

Integer underflow in OpENer EtherNet/IP ForwardOpen parser

Priority HIGH 72CWE-191Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-191 and the CVSS impact.

Summary

OpENer v2.3/commit 76b95cf contains an integer underflow in the server-side EtherNet/IP ForwardOpen connection-path parser, which is classified as CWE-191. A remote attacker without privileges or user interaction can cause a denial of service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

OpENer v2.3/commit 76b95cf, contains an integer underflow in the server-side EtherNet/IP ForwardOpen connection-path parser. This allows a remote attacker to cause a denial of service

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00396 34th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for OpENer.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-10 Threatist record created from CVE-2026-75352
  2. 2026-10-10 Affected versions changed · Red Hat
  3. 2026-10-10 CVSS score added · Red Hat
  4. 2026-10-10 Alias added: GHSA-fgff-hw4c-vx3q
  5. 2026-10-13 CVSS score added · CISA ADP
  6. 2026-10-13 Weakness changed · CISA ADP
  7. 2026-10-13 CISA SSVC decision points changed
  8. 2026-10-13 Priority changed: LOW → HIGH

References

Other 2

Sources

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