A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.1
Affects FortiOS 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, and 7.2.0 through 7.2.11, plus FortiSwitchManager 7.2.0 through 7.2.6. The listed upgrade target is 7.6.4.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 7.6.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: no
- Technical impact: total
Summary
A heap-based buffer overflow in Fortinet's FortiOS network operating system and its FortiSwitchManager companion product lets an attacker run unauthorized code or commands on affected devices by sending specially crafted network packets. Successful exploitation could give the attacker control over the device, compromising its confidentiality, integrity, and availability.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows attacker to execute unauthorized code or commands via specially crafted packets
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA SSVC assessment
Exploitation: active · Automatable: no · Technical impact: total
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- Fortinet FortiSwitchManager
From 7.2.2 · through 7.2.5
- Fortinet FortiOS
From 7.6.0 · through 7.6.2; From 7.4.0 · through 7.4.7; From 7.2.4 · through 7.2.11
References 1
fortiguard.fortinet.com
Questions about CVE-2025-25249
What does this mean?
A heap-based buffer overflow in FortiOS can be triggered by specifically crafted requests, allowing arbitrary code or commands to be executed on the affected device.Source: fortiguard.fortinet.com
Am I affected, and how do I check?
FortiOS 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, 7.2.0 through 7.2.11, 7.0.0 through 7.0.17, and 6.4 (all versions); FortiSwitchManager 7.2.0 through 7.2.6 and 7.0.0 through 7.0.5. Compare the installed version against these ranges.Source: fortiguard.fortinet.com
What should I do about it?
Upgrade to FortiOS 7.6.4 or above, as the advisory states.Source: fortiguard.fortinet.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-09, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data