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Fortinet FortiWeb Pre-authentication DoS attack in OpenSSH - CVE-2025-26466 (FG-IR-25-122)
medium Nessus Plugin ID 275778
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Synopsis
Fortinet Firewall is missing one or more security-related updates.Description
The version of FortiWeb installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the FG-IR-25-122 advisory.- A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack. (CVE-2025-26466)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
For 7.6.x, upgrade to FortiWeb version 7.6.5 or later.See Also
Plugin Details
Severity: Medium
ID: 275778
File Name: fortiweb_FG-IR-25-122.nasl
Version: 1.1
Type: local
Family: Firewalls
Published: 11/19/2025
Updated: 11/19/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5.4
Temporal Score: 4.2
Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2025-26466
CVSS v3
Risk Factor: Medium
Base Score: 5.9
Temporal Score: 5.3
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:fortinet:fortiweb
Required KB Items: Host/Fortigate/model, Host/Fortigate/version
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 3/11/2025
Vulnerability Publication Date: 12/12/2023
Reference Information
CVE: CVE-2025-26466