High7.7F5

NGINX: security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets fro…

CVE-2021-23017 Published Jun 1, 2021Updated by vendor Jun 17, 2026

CVE-2021-23017

Affected products & platforms

F5NGINX

Summary

A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.

Mitigation

Mitigation steps weren't captured by the parser for this advisory — this is a parsing gap, not a statement that no fix exists. Read the vendor advisory below for the authoritative guidance.

Official advisory · medium-confidence parse· fetched 5 hours ago·verify at source

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