CVE-2024-21762 โ Fortinet FortiOS out-of-bounds write (actively exploited)
Out-of-bounds write in FortiOS SSL VPN allows remote code execution. Exploited in the wild; added to KEV.
CRITICAL
CISA KEV
ACTIVELY EXPLOITED
Severity & confidence
Source severitycritical
Platform severitycritical
Confidencehigh
Exploitationactively exploited
CVSS9.8
Affected
VendorsFortinetfortinet
ProductsFortiOS
CountriesUSAU
Sectorsenergygovernmenttelecom
Reporting sources (2)
CISA โ Known Exploited Vulnerabilities
CISA - Known Exploited Vulnerabilities
๐ฏ Why should I care?
- On the CISA Known Exploited Vulnerabilities list.
- Credible sources report active exploitation in the wild.
Timeline & provenance
Published2026-08-15T20:07:49
Last updated2026-10-21T04:58:10
Ingested2026-08-18T20:07:49
FreshnessNEAR-REAL-TIME
Threat typeexploitation
MITRE ATT&CK
T1499
Recommended action
Upgrade FortiOS to a patched release; audit SSL VPN sessions.
Next steps
- Identify affected systems in your environment.
- Apply the vendor patch or mitigation guidance.
- Review logs for indicators described in the advisory.
- Follow the affected vendor/product to track updates.
Confidence explanation
Reported by a government or cert-grade source (CISA, NCSC, NVD, ENISA, MSRC).
Source type: gov ยท Original: CISA โ Known Exploited Vulnerabilities
