CVE-2023-42790
HighCVSS 8.1Exploitation Probability (EPSS)
Elevated risk61th percentile - higher than 61% of all known CVEs
Summary
A stack-based buffer overflow vulnerability in Fortinet FortiOS, FortiProxy, and FortiSASE allows an attacker to execute unauthorized code or commands via specially crafted HTTP requests.
Risk Assessment
An attacker can remotely take control of the affected device, leading to compromise of confidentiality, integrity, and availability of data and network infrastructure.
Recommendation
Immediately update FortiOS, FortiProxy, and FortiSASE to patched versions and restrict access to management interfaces to trusted networks only.
Other vulnerabilities in FortiOS
See all- CVE-2015-7361High
FortiOS version 5.2.3, when configured for High Availability (HA) with the dedicated management interface enabled, does not require authentication for access to the ZebOS shell on this interface. This allows remote attackers to gain shell access via unspecified vectors.
- CVE-2025-68686MediumActively exploited
A vulnerability in Fortinet FortiOS allows a remote unauthenticated attacker to bypass the patch developed for the symbolic link persistency mechanism observed in some post-exploit cases. The attack requires prior compromise of the product via another vulnerability at the filesystem level.
- CVE-2025-24472HighActively exploited
An authentication bypass vulnerability in FortiOS and FortiProxy allows a remote unauthenticated attacker, with prior knowledge of upstream and downstream device serial numbers, to gain super-admin privileges on the downstream device if Security Fabric is enabled. The attack is carried out via crafted CSF proxy requests.
- CVE-2024-55591CriticalActively exploited
An authentication bypass vulnerability in FortiOS and FortiProxy using an alternate path or channel. A remote attacker can gain super-admin privileges by sending crafted requests to the Node.js websocket module.
- CVE-2023-42789Critical
An out-of-bounds write vulnerability in Fortinet FortiOS, FortiProxy, and FortiSASE allows an attacker to execute unauthorized code or commands via specially crafted HTTP requests.
- CVE-2022-40684CriticalActively exploited
An authentication bypass vulnerability in FortiOS, FortiProxy, and FortiSwitchManager allows an unauthenticated attacker to perform operations on the administrative interface via crafted HTTP or HTTPS requests.
- CVE-2019-5591MediumActively exploited
A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.
- CVE-2020-12812CriticalActively exploited
An improper authentication vulnerability in SSL VPN in FortiOS 6.4.0, 6.2.0 to 6.2.3, 6.0.9 and below may result in a user being able to log in successfully without being prompted for the second factor of authentication (FortiToken) if they changed the case of their username.
- CVE-2019-6693MediumActively exploited
Use of a hard-coded cryptographic key to cipher sensitive data in FortiOS configuration backup file may allow an attacker with access to the backup file to decipher the sensitive data, via knowledge of the hard-coded key. The aforementioned sensitive data includes users' passwords (except the administrator's password), private keys' passphrases and High Availability password (when set).
- CVE-2026-71408Medium
Fortinet FortiOS versions 7.6.0-7.6.6, 7.4 (all), and 7.2 (all) have a vulnerability of resource allocation without limits or throttling, which may allow an attacker to cause denial of service.
Original NVD description (English source)
A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2.0 through 7.2.5, FortiOS 7.0.0 through 7.0.12, FortiOS 6.4.0 through 6.4.14, FortiOS 6.2.0 through 6.2.15, FortiProxy 7.4.0, FortiProxy 7.2.0 through 7.2.6, FortiProxy 7.0.0 through 7.0.12, FortiProxy 2.0.0 through 2.0.13, FortiSASE 23.2.b allows attacker to execute unauthorized code or commands via specially crafted HTTP requests.