CVE-2025-59718
A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? Partly. Cloudflare publishes WAF a rule written for this CVE. Such rules block the known exploit requests and buy time, but attackers can change the request to get past them, so they do not replace the patch.
Cloudflare · 1 rule (Block) · since 30 Mar 2026
- Fortinet FortiCloud SSO - Authentication Bypass - CVE:CVE-2025-59718 · Cloudflare Managed Ruleset
Also consider: patch · enable the vendor rule in block mode
Based on WAF vendor rules published for this CVE. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2025-59718 being exploited?
Yes. CVE-2025-59718 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2025-59718?
CVE-2025-59718 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-59718?
Yes. A fix has been recorded for CVE-2025-59718. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-59718 affect?
CVE-2025-59718 affects fortinet:fortiproxy, fortinet:fortiswitchmanager, fortinet:fortios, siemens:ruggedcom_ape1808_firmware. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
- affected>= 7.6.0 and <= 7.6.3
- affected>= 7.4.0 and <= 7.4.8
- affected>= 7.2.0 and <= 7.2.11
- affected>= 7.0.0 and <= 7.0.17
- affected>= 7.6.0 and <= 7.6.3
- affected>= 7.4.0 and <= 7.4.10
- affected>= 7.2.0 and <= 7.2.14
- affected>= 7.0.0 and <= 7.0.21
- affected>= 7.2.0 and <= 7.2.6
- affected>= 7.0.0 and <= 7.0.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
public exploits
Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- total
Assessed by CISA 17 Dec 2025 (SSVC 2.0.3).
timeline
- 9 Dec 2025Published
- 16 Dec 2025Added to CISA KEV (exploited in the wild) · 6 days later
- 17 Dec 2025First proof-of-concept repository on GitHub (unvetted) · 1 day later
- 17 Dec 2025CISA SSVC assessment: exploitation active · same day later
- 23 Dec 2025CISA remediation due date (US federal agencies) · 6 days later
- 15 Oct 2026CVE record last updated · 296 days (about 10 months) later
- 2 Nov 2026Analysed by vulneraibility.com · 19 days later
- Advisoryarcticwolf.com /resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-c
- Linkfortiguard.fortinet.com /psirt/FG-IR-25-647
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718
- Linkcert-portal.siemens.com /productcert/html/ssa-864900.html
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.