CVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.
| Vendor | Fortinet |
|---|---|
| Product | FortiOS and FortiProxy SSL-VPN |
| Date added to KEV | 2023-06-13 |
| Due date (BOD 22-01) | 2023-07-04 |
| Known ransomware campaign use | Known |
| CWE | CWE-122 |
| Required action | Apply updates per vendor instructions. |
What to do
- Identify every instance of Fortinet FortiOS and FortiProxy SSL-VPN in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply updates per vendor instructions.
- Federal civilian agencies must act by 2023-07-04 under BOD 22-01; other organizations can use the same date as a target.
- Because ransomware use is known, check for signs of compromise and confirm backups are offline and tested.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
This CVE is flagged by CISA as known to be used in ransomware campaigns. Rehearse your response before you need it: Ransomware tabletop exercise kit (Runbook Foundry).
Sources
- NVD entry for CVE-2023-27997 (severity scores, if any, live there)
- CISA KEV catalog entry
- https://www.fortiguard.com/psirt/FG-IR-23-097
- https://nvd.nist.gov/vuln/detail/CVE-2023-27997