CVE-2022-42475
CriticalExploitedPublic exploitA heap-based buffer overflow vulnerability [CWE-122] in 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 and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated…
Published Dec 13, 2022 · Updated Oct 21, 2025 · Also known as TR-22-0733
Key Facts
Patch immediately- CVE-2022-42475 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiProxy (Fortinet), FortiOS (Fortinet).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 12, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 99% probability of exploitation in the next 30 days.
- Fixed versions are available, including FortiOS <=5.0.14, FortiProxy <=1.0.7, FortiProxy 1.0.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
99%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2022-42475 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
A heap-based buffer overflow vulnerability [CWE-122] in 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 and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 13, 2022 | Jan 3, 2023 | Known |
| Industry KEV feed | Dec 12, 2022 | Jan 3, 2023 | Known |
| CIRCL KEV | Dec 13, 2022 | Jan 3, 2023 | Known |
| ENISA EUVD | Dec 13, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiProxyFortinet | >= 7.2.0 | 1.0.7 |
| FortiOSFortinet | >= 7.2.0 | 5.0.14 |
Patched Releases
FortiOS
<=5.0.14
FortiProxy
<=1.0.7
Timeline
Added to Industry KEV feed
Dec 12, 2022
Publicly disclosed
Dec 13, 2022
Added to CISA KEV
Dec 13, 2022
Added to CIRCL KEV
Dec 13, 2022
Added to ENISA EUVD
Dec 13, 2022
Last updated
Oct 21, 2025
Weakness Type
- CWE-197 Numeric Truncation Error
- CWE-787 Out-of-bounds Write
References
- advisoryhttps://www.bleepingcomputer.com/news/security/fortinet-says-ssl-vpn-pre-auth-rce-bug-is-exploited-in-attacks/
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploithttps://fortiguard.com/psirt/FG-IR-22-398
FAQ
Common Questions.
A heap-based buffer overflow vulnerability [CWE-122] in 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 and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or command…
Affected: FortiProxy (Fortinet) versions >= 7.2.0; FortiOS (Fortinet) versions >= 7.2.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 12, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on Dec 13, 2022 with a federal remediation due date of Jan 3, 2023.
Public exploit code is available.
Fixed versions are available, including FortiOS <=5.0.14, FortiProxy <=1.0.7, FortiProxy 1.0.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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