Skip to main content
ExploitedNot in CISA KEV yetFix available

CVE-2025-59719

Exploitation confirmed. First attested on 2025-12-16 by ENISA EUVD, GCVE · enisa-cnw-kev, GCVE · kevintel.

  • Published2025-12-09
  • WeaknessCWE-347

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

Timeline

dates in UTC
  1. 2025-12-0918:15CVE publishedNVD
  2. 2025-12-1614:02Listed as exploited by GCVEGCVE
  3. 2025-12-1614:02Exploitation first reportedGCVE
  4. 2026-01-27Reported as exploited by ENISA (EUVD)ENISA EUVD

Versions per branch

NVD
Fortinet fortiweb
BranchAffectedFixed in
7.4≥ 7.4.0, ≤ 7.4.9no fix published
7.6≥ 7.6.0, ≤ 7.6.4no fix published
8.0= 8.0.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As fortinet, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Fortinet FortiWebother versions: not affected
    Affected
    • = 8.0.0no fix stated
    • ≥ 7.6.0, ≤ 7.6.4no fix statedsemver
    • ≥ 7.4.0, ≤ 7.4.9no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-20

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-25-135-01 CISA1 known affected

    Siemens RUGGEDCOM APE1808 Devices

    RUGGEDCOM APE1808

  • SSA-864900 Siemens ProductCERT1 known affected

    SSA-864900: Multiple Vulnerabilities in Fortigate NGFW before V7.6.6 on RUGGEDCOM APE1808 Devices

    RUGGEDCOM APE1808 with Fortinet NGFW < V7.4.9

Full record on NVD

Fix

  1. Vendor fix CISA ICSA-25-135-01 · 1 productUpdate Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information
  2. Vendor fix Siemens ProductCERT SSA-864900 · 1 productUpdate Fortigate NGFW to V7.4.9 or later following the secure update recommendation procedure. Contact customer support to receive detailed information
  3. Mitigation from the vendor CISA ICSA-25-135-01 · 1 productTo prevent being affected by this vulnerability on vulnerable versions, please turn off the FortiCloud login feature (if enabled, disabled by default) temporarily until upgrading to a non-affected version. (see https://fortiguard.fortinet.com/psirt/FG-IR-25-647 for more information)
  4. Mitigation from the vendor Siemens ProductCERT SSA-864900 · 1 productTo prevent being affected by this vulnerability on vulnerable versions, please turn off the FortiCloud login feature (if enabled, disabled by default) temporarily until upgrading to a non-affected version. (see https://fortiguard.fortinet.com/psirt/FG-IR-25-647 for more information)

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2025-12-09
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-chq4-235q-jp7w

Frequently asked questions

What is CVE-2025-59719?

An improper verification of cryptographic signature vulnerability in Fortinet FortiWeb 8.0.0, FortiWeb 7.6.0 through 7.6.4, FortiWeb 7.4.0 through 7.4.9 may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

Is CVE-2025-59719 actively exploited?

Active exploitation of CVE-2025-59719 has not been confirmed. Its EPSS score was 29.2% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-59719?

CVE-2025-59719 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Hear about the next vulnerability in your software

Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

Get alerts for this productCISA KEV additions, November 2026Search CVEs

No credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database

Sources for this record