Out-of-bounds read in EIP Stack Group
Priority MEDIUM 46CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer 2.3 and development commit 8c73bf3. A specially crafted network request can lead to an out-of-bounds read.
Why it matters now
EPSS 0.01667 76th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | EIP Stack Group | EIP Stack Group OpENer 2.3 ,EIP Stack Group OpENer development commit 8c73bf3 | — | No fix listed | CNA |
- EIP Stack Group Vendor— Affected EIP Stack Group OpENer 2.3 ,EIP Stack Group OpENer development commit 8c73bf3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:opener_project:opener:2.3:*:*:*:*:*:*:* | 2.3 | Vulnerable | EIPStackGroup |
- cpe:2.3:a:opener_project:opener:2.3:*:*:*:*:*:*:* Versions 2.3 Vulnerable ·EIPStackGroup
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-21777
- 2026-10-03 Alias added: GHSA-84vv-m336-cjrf
References
More EIPStackGroup Opener vulnerabilities
- 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
Sources
- CVE-2021-21777 · CVE Program
- CVE-2021-21777 · NVD
- FIRST EPSS
- GHSA-84vv-m336-cjrf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences