How severe is CVE-2022-42471?

CVE-2022-42471 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2022-42471 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-42471?

CVE-2022-42471 primarily affects Fortinet Fortiweb. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-42471?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2022-42471 published?

CVE-2022-42471 was published on 2023-01-03 and last updated on 2026-06-17.

CVE-2022-42471

CVE-2022-42471 is a medium-severity vulnerability in Fortinet Fortiweb with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-74.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-74
Affected product: Fortinet Fortiweb
Published: 2023-01-03
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2022-42471?: CVE-2022-42471 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2022-42471 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-42471?: CVE-2022-42471 primarily affects Fortinet Fortiweb. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-42471?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2022-42471 published?: CVE-2022-42471 was published on 2023-01-03 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-22-250

Affected products (7)

cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:6.4.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:6.4.1:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:6.4.2:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:7.0.1:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiweb:7.0.2:*:*:*:*:*:*:*

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