AUGUST 4, 2026
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Case File

CVE-2021-4138

MEDIUM · CVSS 5.3 EPSS 0.81% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2022-05-02 · 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-2021-4138
Severity
MEDIUM
CVSS
5.3
EPSS
0.81%

Original NVD Description

Improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname.