CVE-2025-43892 and CVE-2026-59840: Fortinet Buffer overread in authd and wad daemon
This Fortinet advisory covers CVE-2025-43892 and CVE-2026-59840 in FortiOS and FortiProxy. Its rating, versions and guidance apply to the bulletin as a whole, not to each of its 2 CVEs.
Key facts
- Bulletin rating
- Medium, CVSS 4.3
- Affected
- FortiOS: 6.4.0 through 7.6.3 (vendor-listed versions); FortiProxy: 7.0.0 through 7.6.5 (vendor-listed versions)
- Fixed in
- FortiOS 7.6: 7.6.4, FortiOS 7.4: 7.4.9, FortiOS 7.2: migrate to a fixed release and 6 more below
- Advisory id
- FG-IR-26-154
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
CVSSv3 Score:
4.3
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
Text from the source record.
- FortiOS: 6.4.0 through 7.6.3 (vendor-listed versions)
- FortiProxy: 7.0.0 through 7.6.5 (vendor-listed versions)
Official advisory · high-confidence parse· fetched ·verify at source
Fix and mitigation
Fixed releases named by the bulletin:
- FortiOS 7.6: 7.6.4
- FortiOS 7.4: 7.4.9
- FortiOS 7.2: migrate to a fixed release
- FortiOS 7.0: migrate to a fixed release
- FortiOS 6.4: migrate to a fixed release
- FortiProxy 7.6: 7.6.6
- FortiProxy 7.4: 7.4.14
- FortiProxy 7.2: migrate to a fixed release
- FortiProxy 7.0: migrate to a fixed release
Vendor guidance
- Upgrade per the Affected/Solution table: FortiOS 7.6: 7.6.4; FortiOS 7.4: 7.4.9; FortiOS 7.2: migrate to a fixed release; FortiOS 7.0: migrate to a fixed release; FortiOS 6.4: migrate to a fixed release; ….
Support dates for the fixed release lines
- Fortinet FortiOS 7.6: support ends
- Fortinet FortiOS 7.4: support ends
- Fortinet FortiOS 7.2: support ended
- Fortinet FortiOS 7.0: support ended
- Fortinet FortiOS 6.4: support ended
More Fortinet advisories
CVE-2026-106175Oct 13, 2026Double free in signal handlerCVE-2025-61624Apr 14, 2026Path Traversal in CLICVE-2026-24858Jan 27, 2026FortiOS: Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288]CVE-2025-59718Dec 9, 2025improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0CVE-2025-59719Dec 9, 2025FortiOS: improper verification of cryptographic signature vulnerability in FortinetCVE-2024-47569Oct 14, 2025insertion of sensitive information into sent data vulnerability in Fortinet FortiMail
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