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

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9.2 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

88.92 %

Predictive Probability

Percentile Rank

99.5 th

Documented as more likely to be exploited than 99.5% of known CVEs.

Detection Date

Jun 13, 2023

Remediation Due

Jul 04, 2023

CISA Catalog Active

Threat Analysis

Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

Fortinet

Affected Product

FortiOS and FortiProxy SSL-VPN

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-122

External Intelligence

https://www.fortiguard.com/psirt/FG-IR-23-097

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2023-27997