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Fortinet Patches Critical FortiGate SSL VPN Vulnerability

Fortinet has patched CVE-2023-27997, a critical FortiGate SSL VPN vulnerability that can be exploited for unauthenticated remote code execution.

Fortinet has patched a critical FortiGate vulnerability that can be exploited by an unauthenticated attacker for remote code execution, according to the researchers who reported the flaw to the vendor. 

The vulnerability is tracked as CVE-2023-27997 and it was discovered by researchers at French offensive IT security firm Lexfo. 

Charles Fol, one of the researchers, said on Twitter that the vulnerability affects every SSL VPN appliance and it can be exploited for remote code execution without authentication. 

Fortinet has yet to publish an advisory for the flaw, but French cybersecurity company Olympe Cyberdefense reported that an advisory is expected to become public on June 13. 

The company said the security hole impacts the SSL VPN functionality of FortiGate firewalls, allowing an attacker to “interfere via the VPN”. 

FortiOS 7.0.12, 7.2.5, 6.4.13 and 6.2.15 reportedly contain the patch. 

Vulnerabilities affecting Fortinet products are often exploited by threat actors — both cyberspies and profit-driven cybercriminals — in many cases before a patch has been released.

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CISA’s Known Exploited Vulnerabilities Catalog currently lists 10 Fortinet product vulnerabilities that have been leveraged by malicious actors in their attacks since 2018.

Related: Fortinet Patches Critical Vulnerability in Data Analytics Solution

Related: Chinese Hackers Exploited Fortinet VPN Vulnerability as Zero-Day

Related: Fortinet Finds Zero-Day Exploit in Government Attacks After Devices Detect Integrity Breach

Related: Fortinet Patches Critical Unauthenticated RCE Vulnerability in FortiOS

Written By

Eduard Kovacs (@EduardKovacs) is a managing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

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