CVE-2018-13383 Fortinet FortiOS and FortiProxy Out-of-bounds Write

What is CVE-2018-13383?

CVE-2018-13383 is a medium-severity memory corruption vulnerability in Fortinet Fortios, published on 29 May 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

Weakness: CWE-787

Which versions are affected by CVE-2018-13383?

It affects 2 products.

Products include Fortinet Fortios, Fortinet Fortiproxy.

How do I fix CVE-2018-13383?

No fix has been published for CVE-2018-13383 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 10 Jul 2022.

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

Is CVE-2018-13383 being exploited?

Yes. Attackers have exploited CVE-2018-13383 in the wild since at least 10 Jan 2022, including in ransomware campaigns.

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-cjc8-2cq5-7jq7.