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Exploited vulnerability · CISA KEV

Is CVE-2025-32756 exploited? Yes: in CISA KEV since 14 May 2025

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

Yes. CVE-2025-32756, Fortinet Multiple Products Stack-Based Buffer Overflow Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 14 May 2025, 1 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 · 14 May 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.6CVSS 3.1 · critical
US federal due4 Jun 2025BOD 22-01 deadline

What it is

Fortinet FortiFone, FortiVoice, FortiNDR and FortiMail contain a stack-based overflow vulnerability that may allow a remote unauthenticated attacker to execute arbitrary code or commands via crafted HTTP requests.

VendorFortinet (32 exploited CVEs in KEV)
ProductMultiple Products
VulnerabilityFortinet Multiple Products Stack-Based Buffer Overflow Vulnerability
WeaknessCWE-124
Published13 May 2025
Added to KEV14 May 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 13 May 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-2025-32756 being exploited?

Yes. CISA added CVE-2025-32756 to the Known Exploited Vulnerabilities catalog on 14 May 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-32756 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-2025-32756?

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 May 2025 · Fortinet scorecard · act-now radar.

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