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Case File

CVE-2021-20237

HIGH · CVSS 7.5 EPSS 1.69% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-05-28 · 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.

GitHub PoC Links
github.com ↗

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

CVE
CVE-2021-20237
Severity
HIGH
CVSS
7.5
EPSS
1.69%

Original NVD Description

An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.