What is CVE-2022-42471?

CVE-2022-42471 is a medium-severity vulnerability in Fortinet Fortiweb, classified under HTTP Response Splitting. CVSS score: 5.4/10. Published 2023-01-03.

How severe is CVE-2022-42471?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Fortinet Fortiweb

CVE-2022-42471

An improper neutralization of CRLF sequences in HTTP headers ('HTTP Response Splitting') vulnerability [CWE-113] In FortiWeb version 7.0.0 through 7.0.2, FortiWeb version 6.4.0 through 6.4.2, FortiWeb version 6.3.6 through 6.3.20 may allow an authenticated and remote attacker to inject arbitrary headers.

Published 2023-01-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Fortinet Fortiweb — versions 6.4.0, 7.0.1, 6.4.1

Weakness classification (CWE)

References

fortiguard.com/psirt/FG-IR-22-250 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2022-42471?: CVE-2022-42471 is a medium-severity vulnerability in Fortinet Fortiweb, classified under HTTP Response Splitting. CVSS score: 5.4/10. Published 2023-01-03.
How severe is CVE-2022-42471?: Medium severity. CVSS v3 base score is 5.4 out of 10.