Stack-Based Buffer Overflow Vulnerabilities in FortiWeb Proxy Daemon
CVE-2021-42756

9.3CRITICAL

Key Information:

Vendor

Fortinet
Status
Fortiweb
Vendor
CVE Published:
16 February 2023

Badges

👾 Exploit Exists🟣 EPSS 83%

What is CVE-2021-42756?

Multiple stack-based buffer overflow vulnerabilities exist in the proxy daemon of FortiWeb. These vulnerabilities affect various versions of FortiWeb, allowing unauthenticated remote attackers to execute arbitrary code by sending specially crafted HTTP requests. Organizations using vulnerable FortiWeb versions should take immediate action to mitigate the risk associated with these vulnerabilities.

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Affected Version(s)

FortiWeb 6.4.0 <= 6.4.1

FortiWeb 6.3.0 <= 6.3.16

FortiWeb 6.2.0 <= 6.2.6

References

https://fortiguard.com/psirt/FG-IR-21-186

EPSS Score

83% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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