# CVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

> CVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability. CVSS 9.2 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-27997
Last updated: 2026-07-31T03:55:27Z

- Published: 2023-06-13 08:41 UTC · Updated: 2026-07-31 03:55 UTC · Assigner: fortinet
- CVSS: 9.2 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:X/RC:R
- EPSS: 85.7%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2023-06-13, federal due date 2023-07-04, ransomware use: Known
- CWE: CWE-122

## Description

A heap-based buffer overflow vulnerability \[CWE-122\] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Fortinet: FortiOS
- Fortinet: FortiOS-6K7K
- Fortinet: FortiProxy

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-27997)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-27997)
- [https://fortiguard.com/psirt/FG-IR-23-097](https://fortiguard.com/psirt/FG-IR-23-097)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-27997 · Markdown: https://rewindex.com/cve/CVE-2023-27997.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-27997 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:17.683Z