DoS due to unsafe function in signal handler
CVSSv3 Score: 5.2 A use of potentially Dangerous Function vulnerability [CWE-676] in FortiAnalyzer and FortiManager API may allow an authenticated attacker to cause a system hang via multiple specially crafted HTTP requests causing crashes. This happens if internal locks are aligned, which is out of control of the attacker. Revised on 2026-05-12 00:00:00
CSIRTS triage
- What
- A use of potentially Dangerous Function vulnerability may allow an authenticated attacker to cause a system hang via multiple specially crafted HTTP requests.
- Who is affected
- Authenticated users of FortiAnalyzer and FortiManager are affected.
- Urgency
- Remediation is necessary as this vulnerability can lead to system crashes.
- Action
- Apply the latest patches for FortiAnalyzer and FortiManager.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://fortiguard.fortinet.com/psirt/FG-IR-26-137
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2025-676040.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-67604 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for DoS due to
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
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