CVE-2021-27500
HIGHCVSS 7.5/10EPSS 1.16%
Last modified
CVE-2021-27500 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Opener Project | Opener | <= 2.3 |
References
- https://github.com/EIPStackGroup/OpENerThird Party Advisory
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02Third Party Advisory, US Government Resource
- https://github.com/EIPStackGroup/OpENerThird Party Advisory
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-105-02Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27500?
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.
How severe is CVE-2021-27500?
CVE-2021-27500 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27500?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-27500?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST