FortiOS FortiProxy
CVE-2025-47890
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionNVD
An URL Redirection to Untrusted Site vulnerabilities [CWE-601] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions, FortiSASE 25.2.a may allow an unauthenticated attacker to perform an open redirect attack via crafted HTTP requests.
AnalysisAI
Open redirect vulnerability in Fortinet FortiOS, FortiProxy, and FortiSASE enables unauthenticated attackers on an adjacent network segment to redirect authenticated users to attacker-controlled sites via crafted HTTP requests. The attack surface is substantially constrained by the adjacent-network-only vector (AV:A), high attack complexity (AC:H), and mandatory user interaction (UI:R), yielding a CVSS 2.6 Low severity score. No public exploit identified at time of analysis, and EPSS at 0.01% (1st percentile) confirms negligible observed exploitation pressure. A Siemens PSIRT advisory (SSA-864900) indicates this vulnerability also affects Siemens products embedding Fortinet components.
Technical ContextAI
CWE-601 (URL Redirection to Untrusted Site) describes a class of flaw where an application accepts user-supplied input to construct a redirect URL without validating that the destination is a trusted domain. In this case, the HTTP request handling layer of FortiOS and FortiProxy fails to sanitize redirect target parameters, allowing an adversary to craft a request that causes the server to issue an HTTP redirect to an arbitrary external URL. The affected CPE strings - cpe:2.3:o:fortinet:fortios and cpe:2.3:a:fortinet:fortiproxy - confirm the flaw resides in the core OS/proxy software rather than a peripheral component. FortiSASE, Fortinet's cloud-delivered SASE platform, is also confirmed affected at version 25.2.a per the CVE description, though CPE entries reference version 25.3.40, a discrepancy that warrants clarification from the vendor advisory at FG-IR-24-542. Open redirect vulnerabilities are frequently chained into phishing campaigns where a trusted domain's URL (e.g., fortigate.customer.com) is used to lend legitimacy to a malicious link that ultimately delivers the victim to an adversary-controlled site.
RemediationAI
Consult the Fortinet PSIRT advisory FG-IR-24-542 at https://fortiguard.fortinet.com/psirt/FG-IR-24-542 for patched version specifics; no exact fix versions are confirmed in the available input data, so citing specific upgrade targets is not possible without independent verification. For FortiSASE, the CPE data references version 25.3.40 which may represent the remediated release, but this has not been independently confirmed. As a compensating control, restrict access to FortiOS and FortiProxy management and authentication interfaces to trusted network segments only, which would negate the adjacent-network (AV:A) requirement and eliminate the attack surface for this vulnerability without meaningful operational impact. Organizations running Siemens products using embedded Fortinet components should also review Siemens SSA-864900 for applicable guidance. Given the Low CVSS severity and negligible EPSS score, this vulnerability can be addressed through normal patch cycle processes rather than emergency response.
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