CVE-2020-12819 Memory corruption in FortiOS

What is CVE-2020-12819?

CVE-2020-12819 is a medium-severity memory corruption vulnerability in Fortinet Fortios, published on 19 Dec 2024. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2020-12819?

It affects 1 product.

Products include Fortinet Fortios.

How do I fix CVE-2020-12819?

No fix has been published for CVE-2020-12819 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-12819 being exploited?

There is no known exploitation of CVE-2020-12819 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortios

• CVE-2024-23113 Fortinet Multiple Products Format String Exploited Critical 9.8
• CVE-2022-40684 Fortinet Multiple Products Authentication Bypass Exploited Critical 9.8
• CVE-2024-55591 Fortinet FortiOS and FortiProxy Authentication Bypass Exploited Critical 9.6
• CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Exploited Critical 9.6
• CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Exploited Critical 9.3

All Fortinet Fortios vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8vr7-33jp-gfgw.