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Vulnerability · Published Feb 16, 2023 · Assigned by fortinet

CVE-2021-42756

Critical 9.3

In plain English

A critical-severity stack buffer overflow in FortiWeb from Fortinet. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 35.2% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)9.3Critical
Exploit odds (30 days)35.2%top 1.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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.

Affected products (as reported)

VendorProductVersions
Fortinet FortiWeb 6.4.0 – through 6.4.16.3.0 – through 6.3.166.2.0 – through 6.2.66.1.0 – through 6.1.26.0.0 – through 6.0.75.9.0 – through 5.9.15.8.5 – through 5.8.75.8.0 – through 5.8.3

Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C

References