# CVE-2022-42475: Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability

Source: https://junglewise.ai/threats/cve-2022-42475-fortinet-fortios-heap-based-buffer-overflow-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-12-13. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2022-42475 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-12-13

A heap-based buffer overflow vulnerability in Fortinet FortiOS and FortiProxy SSL-VPN allows a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests. This vulnerability has been observed being exploited in the wild.

Technologies: [Fortinet FortiADC](https://junglewise.ai/threats/technologies/fortiadc), [Fortinet FortiOS](https://junglewise.ai/threats/technologies/fortios), [Fortinet FortiProxy](https://junglewise.ai/threats/technologies/fortiproxy), [Fortinet FortiProxy SSL-VPN](https://junglewise.ai/threats/technologies/fortiproxy-ssl-vpn). Vendors: [Fortinet](https://junglewise.ai/threats/vendors/fortinet).

## Quick answers

**Is CVE-2022-42475 exploited in the wild?** Yes. CVE-2022-42475 is known to be exploited in the wild, first recorded on 13 December 2022. Treat it as urgent.

**How severe is CVE-2022-42475?** Critical severity, with a CVSS score of 9.8, published 13 December 2022.

**Which products and versions are affected?** Fortinet FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier; Fortinet FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier.

**Is there a fix for CVE-2022-42475?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2022-42475 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2022-42475?** Check whether you run Fortinet FortiADC, Fortinet FortiOS, Fortinet FortiProxy or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Fortinet FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier
- Fortinet FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier

## Timeline

- 2022-12-13: disclosed
- 2022-12-13: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

## Related threats

- [Fortinet FortiOS authentication bypass in HA command execution](https://junglewise.ai/threats/cve-2026-126259-a-missing-authentication-for-critical-function-vulnerability-in)
- [Fortinet FortiOS stack buffer overflow in WAD proxy](https://junglewise.ai/threats/cve-2026-126258-a-stack-based-buffer-overflow-vulnerability-in-fortinet-fortios)
- [Fortinet FortiOS out-of-bounds read in kernel](https://junglewise.ai/threats/cve-2026-126256-a-out-of-bounds-read-vulnerability-in-fortinet-fortios-8-0-0)
- [Fortinet FortiOS path traversal authentication bypass in SSH daemon](https://junglewise.ai/threats/cve-2026-126255-a-path-traversal-filedir-vulnerability-in-fortinet-fortios-8-0-0)
- [Fortinet FortiOS numeric truncation error in BGP daemon](https://junglewise.ai/threats/cve-2026-126254-a-numeric-truncation-error-vulnerability-in-fortinet-fortios-8-0)