AUGUST 4, 2026
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Case File

CVE-2021-23017

HIGH · CVSS 7.7 EPSS 53.46% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-06-01 · Last synced 2026-08-04

CyberRota Analysis

AI analysis pending.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

External Security References
packetstormsecurity.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-23017
Severity
HIGH
CVSS
7.7
EPSS
53.46%
Nginx

Original NVD Description

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.