What is CVE-2023-27997?

CVE-2023-27997 is a critical-severity vulnerability in Fortinet Fortigate 6000, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2023-06-13.

How severe is CVE-2023-27997?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2023-27997 known to be exploited?

Yes. CVE-2023-27997 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-06-13), indicating it is being actively exploited. 46 public proof-of-concept repositories are indexed.

Buffer overflow in Fortinet Fortigate 6000

CVE-2023-27997

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.

Vulnerability class: Buffer Overflow

EPSS: 0.857 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Fortinet Fortigate_6000
Fortinet Fortigate_7000
Fortinet Fortios — versions 6.4.0, 6.4.10, 6.2.7
Fortinet Fortios-6k7k — versions 7.0.10, 7.0.5, 6.4.12
Fortinet Fortiproxy — versions 7.2.0, 7.0.0, 2.0.0

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-06-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-07-04.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

psirt@fortinet.com (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2023-27997?: CVE-2023-27997 is a critical-severity vulnerability in Fortinet Fortigate 6000, classified under Heap-based Buffer Overflow. CVSS score: 9.8/10. Published 2023-06-13.
How severe is CVE-2023-27997?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-27997 known to be exploited?: Yes. CVE-2023-27997 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-06-13), indicating it is being actively exploited. 46 public proof-of-concept repositories are indexed.