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CVE-2024-21762

Fortinet FortiOS Out-of-Bound Write Vulnerability

  • Critical 9.6
  • Exploited: added to CISA KEV 9 Feb 2024
  • Used in ransomware campaigns

Description

A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.2, FortiOS 7.2.0 through 7.2.6, FortiOS 7.0.0 through 7.0.13, FortiOS 6.4.0 through 6.4.14, FortiOS 6.2.0 through 6.2.15, FortiOS 6.0 all versions, FortiProxy 7.4.0 through 7.4.2, FortiProxy 7.2.0 through 7.2.8, FortiProxy 7.0.0 through 7.0.14, FortiProxy 2.0.0 through 2.0.13, FortiProxy 01.02 all versions, FortiProxy 1.2 all versions, FortiProxy 01.01 all versions, FortiProxy 1.1 all versions, FortiProxy 01.00 all versions allows attacker to execute unauthorized code or commands via specifically crafted requests

Key facts

Published
9 Feb 2024
Last changed
22 Oct 2026
Assigned by
fortinet
KEV added
9 Feb 2024
KEV fix due
16 Feb 2024
Used in ransomware
Yes, according to CISA
EPSS
84.589% likely to be exploited in the next 30 days, higher than 99.71% 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.

  • 9.6CVSS 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:H/RL:W/RC:C

What to do

  • Upgrade to FortiProxy version 7.4.3 or above Upgrade to FortiProxy version 7.2.9 or above Upgrade to FortiProxy version 7.0.15 or above Upgrade to FortiProxy version 2.0.14 or above Upgrade to FortiOS version 7.4.3 or above Upgrade to FortiOS version 7.2.7 or above Upgrade to FortiOS version 7.0.14 or above Upgrade to FortiOS version 6.4.15 or above Upgrade to FortiOS version 6.2.16 or aboveCNA solution statement
  • Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.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
FortinetFortiOS
  • Default status: unaffected
  • 7.4.0 up to and including 7.4.2 (affected)
  • 7.2.0 up to and including 7.2.6 (affected)
  • 7.0.0 up to and including 7.0.13 (affected)
  • 6.4.0 up to and including 6.4.14 (affected)
  • 6.2.0 up to and including 6.2.15 (affected)
  • 6.0.0 up to and including 6.0.18 (affected)
FortinetFortiProxy
  • Default status: unaffected
  • 7.4.0 up to and including 7.4.2 (affected)
  • 7.2.0 up to and including 7.2.8 (affected)
  • 7.0.0 up to and including 7.0.14 (affected)
  • 2.0.0 up to and including 2.0.13 (affected)
  • 1.2.1 up to and including 1.2.13 (affected)
  • 01.02.00 (affected)
  • 1.1.4 up to and including 1.1.6 (affected)
  • 01.01.00 up to and including 01.01.03 (affected)
  • 01.00.00 up to and including 01.00.07 (affected)

Timeline

  1. 9 Feb 2024 CVE-2024-21762 added to CISA KEV
  2. 9 Feb 2024 Added to the CISA KEV catalogue
  3. 9 Feb 2024 Published

Weakness

References