No exploitation reportedFix available

CVE-2022-27491

Q: Is CVE-2022-27491 actively exploited?

Active exploitation of CVE-2022-27491 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2022-27491?

CVE-2022-27491 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-09-06
Fixed in7.0.6 · 6.4.9 · 6.2.11

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A improper verification of source of a communication channel in Fortinet FortiOS with IPS engine version 7.201 through 7.214, 7.001 through 7.113, 6.001 through 6.121, 5.001 through 5.258 and before 4.086 allows a remote and unauthenticated attacker to trigger the sending of "blocked page" HTML data to an arbitrary victim via crafted TCP requests, potentially flooding the victim.

Timeline

dates in UTC

2022-09-0618:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-27491?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-27491?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Fortinet FortiOS

Branch	Affected	Fixed in	Source
7.0	≥ 7.0.0, < 7.0.6	7.0.6	NVD
6.4	≥ 6.4.0, < 6.4.9	6.4.9	NVD
6.2	≥ 6.2.0, < 6.2.11	6.2.11	NVD
6.0	≥ 6.0.0, ≤ 6.0.14	no fix published	NVD
7.2	= 7.2.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Fortinet FortiOS to 7.0.6 · 6.4.9 · 6.2.11

Advisories and patches

fortiguard.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2024-10-22
OpenCVESSVC decisionnone—
CNACVSS 3.16.8read 2026-10-23
NVDCVSS 3.17.5read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2022-09-06
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2022-27491?

Is CVE-2022-27491 actively exploited?

Active exploitation of CVE-2022-27491 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-27491?

CVE-2022-27491 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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