Buffer overread in authd and wad daemon
CVSSv3 Score: 4.1 A buffer over-read vulnerability [CWE-126] in FortiOS, FortiProxy, and FortiSASE may allow an authenticated remote attacker to return a portion of device memory in the redirect response via submitting a specially crafted request. Revised on 2026-07-14 00:00:00
CSIRTS triage
- What
- An authenticated remote attacker may return a portion of device memory in the redirect response.
- Who is affected
- Authenticated users of FortiOS, FortiProxy, and FortiSASE.
- Urgency
- Remediation is necessary to prevent information disclosure.
- Action
- Apply the latest patches for FortiOS, FortiProxy, and FortiSASE.
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-26-154
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-2025-438920.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.
- Low exploitation riskCVE-2026-598400.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-43892 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-59840 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- low[NEW] [low] Fortinet FortiProxy and FortiOS: Multiple vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Fortinet products (July 15, 2026)cert-fr-avis
- mediumCVE-2026-59840: A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 throug…nvd
- mediumCVE-2025-43892: A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 throug…nvd
Recent advisories for Buffer overread in
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.
More from Fortinet FortiGuard PSIRT
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