SEPTEMBER 29, 2026
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Case File

CVE-2021-40540

CRITICAL · CVSS 9.8 EPSS 2.63% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-09-07 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

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

GitHub PoC Links
github.com ↗ github.com ↗
External Security References
packetstormsecurity.com ↗

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

CVE
CVE-2021-40540
Severity
CRITICAL
CVSS
9.8
EPSS
2.63%

Original NVD Description

ulfius_uri_logger in Ulfius HTTP Framework before 2.7.4 omits con_info initialization and a con_info->request NULL check for certain malformed HTTP requests.