[UPDATE] [high] Fortinet FortiOS: Multiple Vulnerabilities

highCVE-2025-68686 CVE-2025-55018 CVE-2025-62439 CVE-2025-64157 CVE-2026-22153

An attacker can exploit multiple vulnerabilities in Fortinet FortiOS to bypass security measures, disclose information, or execute code.

CSIRTS triage

vendor: Fortinet product: FortiOS Remote code execution Authentication bypass Information disclosureOther

What: Multiple vulnerabilities allow an attacker to bypass security measures, disclose information, or execute code.
Who is affected: Deployments of Fortinet FortiOS are affected.
Urgency: Remediation is urgent due to confirmed exploitation and high severity.
Action: Apply the latest security updates from Fortinet.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-07-28
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0387

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.

Moderate exploitation riskCVE-2025-686861.3% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 67% of all scored CVEs.
Low exploitation riskCVE-2025-550180.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all scored CVEs.
Low exploitation riskCVE-2025-624390.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.
Moderate exploitation riskCVE-2025-641571.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 69% of all scored CVEs.
Low exploitation riskCVE-2026-221530.70% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2025-68686	coverage & exploitation status	NVD · CVE.org
CVE-2025-55018	coverage & exploitation status	NVD · CVE.org
CVE-2025-62439	coverage & exploitation status	NVD · CVE.org
CVE-2025-64157	coverage & exploitation status	NVD · CVE.org
CVE-2026-22153	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownexploitedFortinet security advisory (AV26-109) – Update 1cccs
highexploitedCISA Adds Two Known Exploited Vulnerabilities to Catalogcisa
criticalexploitedCVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerabilitycisa-kev
unknownLDAP authentication bypass in Agentless VPN and FSSOfortinet

Recent advisories for Fortinet FortiOS

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.

criticalexploitedCVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerabilitycisa-kev · 2026-07-27
low[NEW] [low] Fortinet FortiProxy and FortiOS: Multiple vulnerabilitiescert-bund · 2026-07-15
medium[NEW] [medium] Fortinet FortiOS and FortiProxy: Multiple vulnerabilitiescert-bund · 2026-07-15
mediumCVE-2026-59840: A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 throug…nvd · 2026-07-14
mediumCVE-2026-59839: A improper limitation of a pathname to a restricted directory ('path traversal') vulnerability…nvd · 2026-07-14
mediumCVE-2026-59837: A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7…nvd · 2026-07-14