CISA KEV · Known exploitedCritical

CVE-2023-27997

Fortinet FortiOS-6K7K, FortiProxy, FortiOS

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: 9.8
EPSS: 85.7%
CISA KEV: Listed
Published: 2023.06.13

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability85.7%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Fortinet FortiOS-6K7K, FortiProxy, FortiOS
Affected versions: >= 7.0.10, >= 7.0.5, >= 6.4.12, >= 6.4.10, >= 6.4.8, >= 6.4.6, >= 6.4.2, >= 6.2.9 <= 6.2.13, >= 6.2.6 <= 6.2.7, >= 6.2.4, >= 6.0.12 <= 6.0.16, >= 6.0.10, >= 7.2.0 <= 7.2.3, >= 7.0.0 <= 7.0.9, >= 2.0.0 <= 2.0.12, >= 1.2.0 <= 1.2.13, >= 1.1.0 <= 1.1.6, >= 7.2.0 <= 7.2.4, >= 7.0.0 <= 7.0.11, >= 6.4.0 <= 6.4.12
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2023.07.04

1
Identify
Confirm that Fortinet FortiOS-6K7K, FortiProxy, FortiOS and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-122, CWE-787
KEV added: 2023.06.13
Ransomware use: 확인됨