What’s Vulnerable › Vulnerabilities
CVE-2020-12819
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-12-19 · updated 2026-06-17
- Weakness: CWE-122
Description
A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiGate versions 5.6.12, 6.0.10, 6.2.4 and 6.4.1 and earlier may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel mode is enabled. Arbitrary code execution may be theoretically possible, albeit practically very difficult to achieve in this context
Affected products
- Fortinet FortiOS (FortiGate): before 5.6.13; from 6.0.0 before 6.0.11; from 6.2.0 before 6.2.5; from 6.4.0 before 6.4.2 — fixed in 5.6.13, 6.0.11, 6.2.5, 6.4.2
How to fix
Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 5.6.13, 6.0.11, 6.2.5, 6.4.2. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2020-12819 or the next vulnerability affects your stack