CVE-2021-34586
HIGHCVSS 7.5/10EPSS 13.08%
Last modified
CVE-2021-34586 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.. EPSS estimates a 13.08% chance of exploitation in the next 30 days.
Description
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and 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 |
|---|---|---|
| Wago | 750-823 Firmware | < fw10 |
| Wago | 750-829 Firmware | < fw17 |
| Wago | 750-831 Firmware | < fw17 |
| Wago | 750-832 Firmware | < fw10 |
| Wago | 750-852 Firmware | < fw17 |
| Wago | 750-862 Firmware | < fw10 |
| Wago | 750-880 Firmware | < fw17 |
| Wago | 750-881 Firmware | < fw17 |
| Wago | 750-882 Firmware | < fw17 |
| Wago | 750-885 Firmware | < fw17 |
| Wago | 750-889 Firmware | < fw17 |
| Wago | 750-890 Firmware | < fw10 |
| Wago | 750-891 Firmware | < fw10 |
| Wago | 750-893 Firmware | < fw10 |
| Wago | 750-8202 Firmware | < fw20 |
| Wago | 750-8203 Firmware | < fw20 |
| Wago | 750-8204 Firmware | < fw20 |
| Wago | 750-8206 Firmware | < fw20 |
| Wago | 750-8207 Firmware | < fw20 |
| Wago | 750-8208 Firmware | < fw20 |
| Wago | 750-8210 Firmware | < fw20 |
| Wago | 750-8211 Firmware | < fw20 |
| Wago | 750-8212 Firmware | < fw20 |
| Wago | 750-8213 Firmware | < fw20 |
| Wago | 750-8214 Firmware | < fw20 |
| Wago | 750-8216 Firmware | < fw20 |
| Wago | 750-8217 Firmware | < fw20 |
| Codesys | Codesys | < 1.1.9.22 |
References
- https://www.tenable.com/security/research/tra-2021-47Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-47Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-34586?
In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition.
How severe is CVE-2021-34586?
CVE-2021-34586 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 13.08% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34586?
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-2021-34586?
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Scan your code nowSource: NVD / NIST