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TI-2021-08983 Aliases CVE-2021-27498GHSA-fhpr-42xj-phj9

EIPStackGroup OpENer Ethernet/IP Reachable Assertion

Priority MEDIUM 42CWE-617Published · 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
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-617.

Summary

A specifically crafted packet sent by an attacker to EIPStackGroup OpENer EtherNet/IP commits and versions prior to Feb 10, 2021 may result in a denial-of-service condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01346 71st percentileScored 2026-11-07
Fix Fixed OpENer EtherNet/IP (EIPStackGroup): Feb 10, 2021

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
EIPStackGroupOpENer EtherNet/IPbefore Feb 10, 2021Feb 10, 2021Patch availableCNA
  • OpENer EtherNet/IP VendorEIPStackGroup Affected before Feb 10, 2021 Fixed in Feb 10, 2021 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:opener_project:opener:*:*:*:*:*:*:*:*up to 2.3VulnerableEIPStackGroup
  • cpe:2.3:a:opener_project:opener:*:*:*:*:*:*:*:* Versions up to 2.3 Vulnerable ·EIPStackGroup

Remediation

  • Fix · CNA OpENer EtherNet/IP (EIPStackGroup) Fixed in Feb 10, 2021

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    EIPStackGroup OpENer EtherNet/IP Feb 10, 2021

    4 records Highest priority Priority MEDIUM 4 MEDIUM

    Other records, highest priority first

    • TI-2021-08964 EIPStackGroup OpENer Ethernet/IP Incorrect Conversion between Numeric TypesPriority MEDIUM 44
    • TI-2021-08985 EIPStackGroup OpENer Ethernet/IP Reachable AssertionPriority MEDIUM 42
    • TI-2021-08968 EIPStackGroup OpENer Ethernet/IP Out-of-bounds ReadPriority MEDIUM 42
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27498
  2. 2026-10-03 Alias added: GHSA-fhpr-42xj-phj9

References

Advisory 2

  • TI-2026-37502 OpENer 2.3.0 (master branch up to commit 76b95cf) is vulnerable to a severe memory… CVSS 3.1CRITICAL 9.8
  • TI-2022-21373 Out-of-bounds write in EIPStackGroup OpENer CVSS 3.1CRITICAL 10.0
  • TI-2022-21372 Out-of-bounds write in EIPStackGroup OpENer CVSS 3.1CRITICAL 10.0
  • TI-2026-37503 OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in CIP message parsing when… CVSS 3.1CRITICAL 9.1
  • TI-2026-37500 EIPStackGroup OpENer 2.3.0 (commit 76b95cf) suffers from an Incorrect Access Control… CVSS 3.1CRITICAL 9.1
  • TI-2026-37499 EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection… CVSS 3.1CRITICAL 9.1
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences