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CVE-2022-42475

Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability

  • Critical 9.3
  • Exploited: added to CISA KEV 13 Dec 2022
  • Used in ransomware campaigns

Description

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.

Key facts

Published
2 Jan 2023
Last changed
21 Oct 2025
Assigned by
fortinet
KEV added
13 Dec 2022
KEV fix due
3 Jan 2023
Used in ransomware
Yes, according to CISA
EPSS
99.474% likely to be exploited in the next 30 days, higher than 99.943% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 3.1, Criticalfrom the CNA (fortinet)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

What to do

  • Please upgrade to FortiOS version 7.2.3 or above Please upgrade to FortiOS version 7.0.9 or above Please upgrade to FortiOS version 6.4.11 or above Please upgrade to FortiOS version 6.2.12 or above Please upgrade to FortiOS version 6.0.16 or above Please upgrade to upcoming FortiOS-6K7K version 7.0.8 or above Please upgrade to FortiOS-6K7K version 6.4.10 or above Please upgrade to FortiOS-6K7K version 6.2.12 or above Please upgrade to FortiOS-6K7K version 6.0.15 or above Please upgrade to FortiProxy version 7.2.2 or above Please upgrade to FortiProxy version 7.0.8 or above Please upgrade to upcoming FortiProxy version 2.0.12 or aboveCNA solution statement
  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
FortinetFortiProxy
  • Default status: unaffected
  • 7.2.0 up to and including 7.2.1 (affected)
  • 7.0.0 up to and including 7.0.7 (affected)
  • 2.0.0 up to and including 2.0.11 (affected)
  • 1.2.0 up to and including 1.2.13 (affected)
  • 1.1.0 up to and including 1.1.6 (affected)
  • 1.0.0 up to and including 1.0.7 (affected)
FortinetFortiOS
  • Default status: unaffected
  • 7.2.0 up to and including 7.2.2 (affected)
  • 7.0.0 up to and including 7.0.8 (affected)
  • 6.4.0 up to and including 6.4.10 (affected)
  • 6.2.0 up to and including 6.2.11 (affected)
  • 6.0.0 up to and including 6.0.15 (affected)
  • 5.6.0 up to and including 5.6.14 (affected)
  • 5.4.0 up to and including 5.4.13 (affected)
  • 5.2.0 up to and including 5.2.15 (affected)
  • 5.0.0 up to and including 5.0.14 (affected)

Timeline

  1. 13 Dec 2022 CVE-2022-42475 added to CISA KEV
  2. 13 Dec 2022 Added to the CISA KEV catalogue
  3. 2 Jan 2023 Published

Weakness

References