CVE-2021-43206 Information disclosure in Fortinet FortiOS, FortiProxy

What is CVE-2021-43206?

CVE-2021-43206 is a medium-severity vulnerability in Fortinet Fortios, published on 4 May 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A server-generated error message containing sensitive information in Fortinet FortiOS 7.0.0 through 7.0.3, 6.4.0 through 6.4.8, 6.2.x, 6.0.x and FortiProxy 7.0.0 through 7.0.1, 2.0.x allows malicious webservers to retrieve a web proxy's client username and IP via same origin HTTP requests triggering proxy-generated HTTP status codes pages.

Weakness: CWE-209

Which versions are affected by CVE-2021-43206?

It affects 2 products.

Products include Fortinet Fortios, Fortinet Fortiproxy.

How do I fix CVE-2021-43206?

No fix has been published for CVE-2021-43206 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-43206 being exploited?

There is no known exploitation of CVE-2021-43206 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-9645-9xqx-6r37.