CVE-2023-27997A 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…
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It affects Fortinet FortiOS-6K7K and 2 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jun 13, 2023; federal agencies had to remediate by Jul 4, 2023, and it is known to be used in ransomware. Treat that date as your deadline.
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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.
- CVSS
- 9.2 CRITICAL (v3.1, CNA)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
- Weakness (CWE)
- CWE-122
- Known exploited
- Added to CISA KEV Jun 13, 2023; federal remediation due Jul 4, 2023; known ransomware useApply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 85.69% (percentile 100)
- Assigned by
- fortinet
- NVD analysis
- Analyzed
- Record last updated
- Jul 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Fortinet FortiOS-6K7K fortinet:fortios_6k7k (from the name) | 7.0.10; 7.0.5; 6.4.12; 6.4.10; 6.4.8; 6.4.6; 6.4.2; from 6.2.9 through 6.2.13; and 4 more ranges | CNA record |
Fortinet FortiProxy fortinet:fortiproxy (from the name) | from 7.2.0 through 7.2.3; from 7.0.0 through 7.0.9; from 2.0.0 through 2.0.12; from 1.2.0 through 1.2.13; from 1.1.0 through 1.1.6 | CNA record |
Fortinet FortiOS fortinet:fortios (from the name) | from 7.2.0 through 7.2.4; from 7.0.0 through 7.0.11; from 6.4.0 through 6.4.12; from 6.2.0 through 6.2.13; from 6.0.0 through 6.0.16 | CNA record |
fortinet fortiproxy fortinet:fortiproxy | from 1.1.0 through 1.1.6; from 1.2.0 through 1.2.13; from 2.0.0 through 2.0.12; from 7.0.0 through 7.0.9; from 7.2.0 through 7.2.3 | NVD |
fortinet fortios fortinet:fortios | from 6.0.0 through 6.0.16; from 6.2.0 through 6.2.13; from 6.4.0 through 6.4.12; from 7.0.0 through 7.0.11; from 7.2.0 through 7.2.4; from 6.0.12 through 6.0.16; from 6.2.9 through 6.2.13; 6.0.10; and 10 more ranges | NVD |
References
- https://fortiguard.com/psirt/FG-IR-23-097vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27997us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.