UpHeron
All vulnerabilities

Servers and applications

CVE-2021-23017

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.

Severity
High 7.7
Published
1 Jun 2021
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Fixed in
1.19.3.2, 1.20.1
Sources
NVD

Affected software

SoftwareAffected versions
nginxServers and applications · cpe:a:f5:nginx
  • From 0.6.18 before 1.20.1
OpenRestyServers and applications · cpe:a:openresty:openresty
  • Every version before 1.19.3.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-23017
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-23017