High severity7.5NVD Advisory· Published Oct 26, 2021· Updated Jun 17, 2026

CVE-2021-34586

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Codesys/CODESYS V2 web serverllm-fuzzy
Range: <1.1.9.22
Codesys/V3llm-fuzzy2 versions
<1.1.9.22+ 1 more
- (no CPE)range: <1.1.9.22
- (no CPE)range: all web servers

Patches

Vulnerability mechanics

References

www.tenable.com/security/research/tra-2021-47nvdExploitThird Party Advisory
customers.codesys.com/index.phpnvdVendor Advisory

News mentions

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epss	0.010
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