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Exploited vulnerability · CISA KEV

Is CVE-2025-59718 exploited? Yes: in CISA KEV since 16 Dec 2025

Gociux · Fortinet Multiple Products · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-59718, Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 16 Dec 2025, 7 days after it was published. It affects Fortinet Multiple Products, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 16 Dec 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.1CVSS 3.1 · critical
US federal due23 Dec 2025BOD 22-01 deadline

What it is

Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.

VendorFortinet (32 exploited CVEs in KEV)
ProductMultiple Products
VulnerabilityFortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
WeaknessCWE-347
Published9 Dec 2025
Added to KEV16 Dec 2025
Reported by (CNA)fortinet

What to do

  1. Check whether you run it. Look for Multiple Products in your asset inventory, including appliances and cloud images. Stack check lists every exploited Fortinet CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 9 Dec 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for Fortinet.

Other exploited CVEs in Multiple Products

References

Questions

Is CVE-2025-59718 being exploited?

Yes. CISA added CVE-2025-59718 to the Known Exploited Vulnerabilities catalog on 16 Dec 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-59718 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-59718?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Fortinet's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Multiple Products and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2025 · Fortinet scorecard · act-now radar.

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