AUGUST 4, 2026
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Case File

CVE-2021-42756

CRITICAL · CVSS 9.8 EPSS 34.98% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2023-02-16 · 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. Its EPSS score suggests a 35.0% probability of exploitation in the next 30 days. It may be remotely exploitable.

Public Exploit Signal

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

Detected Signals
arbitrary code execution code execution

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

CVE
CVE-2021-42756
Severity
CRITICAL
CVSS
9.8
EPSS
34.98%

Original NVD Description

Multiple stack-based buffer overflow vulnerabilities [CWE-121] in the proxy daemon of FortiWeb 5.x all versions, 6.0.7 and below, 6.1.2 and below, 6.2.6 and below, 6.3.16 and below, 6.4 all versions may allow an unauthenticated remote attacker to achieve arbitrary code execution via specifically crafted HTTP requests.

Related CVEs

Other vulnerabilities affecting the same vendor(s)