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CVE-2023-27997

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

Fortinet · CWE-122 | CWE-787 — Out-of-bounds write · in CISA KEV since 2023-06-13

ExigentKEV since 2023 · listed over a yearRansomwareCISA KEVActively Exploited
90

EVRS 90 of 100 Immediate

Out-of-Band / Urgent Remediation

Rank 149 of 2,960 tracked

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Why it scores 90

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and associated with known ransomware campaigns.

  • CISA KEVApplied
  • RansomwareApplied
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

fortiproxy: update to a version newer than 1.1.6 | fortiproxy: update to a version newer than 1.2.13 | fortiproxy: update to a version newer than 2.0.12 | fortiproxy: update to a version newer than 7.0.9 | fortiproxy: update to a version newer than 7.2.3 | fortios: update to a version newer than 6.0.16

Affected versions

  • fortiproxy>= 1.1.0 <= 1.1.6>= 1.2.0 <= 1.2.13>= 2.0.0 <= 2.0.12>= 7.0.0 <= 7.0.9>= 7.2.0 <= 7.2.3
  • fortios>= 6.0.0 <= 6.0.16>= 6.2.0 <= 6.2.13>= 6.4.0 <= 6.4.12>= 7.0.0 <= 7.0.11>= 7.2.0 <= 7.2.4>= 6.0.12 <= 6.0.16>= 6.2.9 <= 6.2.136.0.106.2.46.2.66.2.76.4.26.4.66.4.86.4.106.4.127.0.57.0.10
  • fortigate 6000
  • fortigate 7000

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 9.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.857 (99.73rd pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Known CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2023-07-04 · KEV since 2023 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.2 (v3.1), assigned by fortinet. Listed ENISA EUVD

Description

NVD

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.

What CISA says to do