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CVE-2023-27997

Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

  • Critical 9.2
  • Exploited: added to CISA KEV 13 Jun 2023
  • Used in ransomware campaigns

Description

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.

Key facts

Published
13 Jun 2023
Last changed
31 Jul 2026
Assigned by
fortinet
KEV added
13 Jun 2023
KEV fix due
4 Jul 2023
Used in ransomware
Yes, according to CISA
EPSS
86.75% likely to be exploited in the next 30 days, higher than 99.746% 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.

  • 9.2CVSS 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:F/RL:X/RC:R

What to do

  • Please upgrade to FortiOS-6K7K version 7.0.12 or above Please upgrade to FortiOS-6K7K version 6.4.13 or above Please upgrade to FortiOS-6K7K version 6.2.15 or above Please upgrade to FortiOS-6K7K version 6.0.17 or above Please upgrade to FortiProxy version 7.2.4 or above Please upgrade to FortiProxy version 7.0.10 or above Please upgrade to FortiOS version 7.4.0 or above Please upgrade to FortiOS version 7.2.5 or above Please upgrade to FortiOS version 7.0.12 or above Please upgrade to FortiOS version 6.4.13 or above Please upgrade to FortiOS version 6.2.14 or above Please upgrade to FortiOS version 6.0.17 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
FortinetFortiOS-6K7K
  • Default status: unaffected
  • 7.0.10 (affected)
  • 7.0.5 (affected)
  • 6.4.12 (affected)
  • 6.4.10 (affected)
  • 6.4.8 (affected)
  • 6.4.6 (affected)
  • 6.4.2 (affected)
  • 6.2.9 up to and including 6.2.13 (affected)
  • 6.2.6 up to and including 6.2.7 (affected)
  • 6.2.4 (affected)
  • 6.0.12 up to and including 6.0.16 (affected)
  • 6.0.10 (affected)
FortinetFortiProxy
  • Default status: unaffected
  • 7.2.0 up to and including 7.2.3 (affected)
  • 7.0.0 up to and including 7.0.9 (affected)
  • 2.0.0 up to and including 2.0.12 (affected)
  • 1.2.0 up to and including 1.2.13 (affected)
  • 1.1.0 up to and including 1.1.6 (affected)
FortinetFortiOS
  • Default status: unaffected
  • 7.2.0 up to and including 7.2.4 (affected)
  • 7.0.0 up to and including 7.0.11 (affected)
  • 6.4.0 up to and including 6.4.12 (affected)
  • 6.2.0 up to and including 6.2.13 (affected)
  • 6.0.0 up to and including 6.0.16 (affected)

Timeline

  1. 13 Jun 2023 CVE-2023-27997 added to CISA KEV
  2. 13 Jun 2023 Added to the CISA KEV catalogue
  3. 13 Jun 2023 Published

Weakness

References