CVE-2023-27997 vulnerability in Fortinet Products
Published on June 13, 2023

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.

Vendor Advisory NVD

Known Exploited Vulnerability

This Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. 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.

The following remediation steps are recommended / required by July 4, 2023: Apply updates per vendor instructions.

Vulnerability Analysis

CVE-2023-27997 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. It has the highest possible exploitability rating (3.9). The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2023-27997 has been classified to as a Memory Corruption vulnerability or weakness.

Products Associated with CVE-2023-27997

You can be notified by stack.watch whenever vulnerabilities like CVE-2023-27997 are published in these products:

Fortinet Fortiproxy

Fortinet Fortios

Fortinet Fortios 6k7k

What versions are vulnerable to CVE-2023-27997?