An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an attacker able to intercept and modify a user's captive portal authentication request to inject arbitrary headers via crafted HTTP requests
Published Jul 14, 2026
4.3
MEDIUMCVSS 3.1
EPSS 0.37%
Description
An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability [CWE-113] vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an attacker able to intercept and modify a user's captive portal authentication request to inject arbitrary headers via crafted HTTP requests.
Affected products
-
- Version 6.4.0StatusaffectedConstraints<=6.4.16
- Version 7.0.0StatusaffectedConstraints<=7.0.19
- Version 7.2.0StatusaffectedConstraints<=7.2.13
- Version 7.4.0StatusaffectedConstraints<=7.4.8
- Version 7.6.0StatusaffectedConstraints<=7.6.2
- Version
-
- Version 1.0.0StatusaffectedConstraints<=1.0.3
- Version 1.1.0StatusaffectedConstraints<=1.1.2
- Version 1.2.0StatusaffectedConstraints-
- Version 1.3.0StatusaffectedConstraints<=1.3.1
- Version 1.4.0StatusaffectedConstraints<=1.4.3
- Version 1.5.0StatusaffectedConstraints<=1.5.1
- Version 1.6.0StatusaffectedConstraints<=1.6.2
- Version 1.7.0StatusaffectedConstraints-
- Version
-
- Version 7.0.0StatusaffectedConstraints<=7.0.23
- Version 7.2.0StatusaffectedConstraints<=7.2.16
- Version 7.4.0StatusaffectedConstraints<=7.4.14
- Version 7.6.0StatusaffectedConstraints<=7.6.4
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fortinet | FortiOS | unaffected |
| |||||||||||||||||||||||||||
| Fortinet | FortiPAM | unaffected |
| |||||||||||||||||||||||||||
| Fortinet | FortiProxy | unaffected |
|
- ≥ 7.2.0 · < 7.6.5
- ≥ 7.2.0 · < 7.6.5
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to FortiProxy version 7.6.5 or above Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.5 or above Fortinet remediated this issue in FortiSASE version 25.4.b and hence customers do not need to perform any action. Fortinet remediated this issue in FortiSASE version 25.4.a and hence customers do not need to perform any action.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jul 14, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Jul–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.37% (0.00372) | 28.74th | v5 (v2026.06.15) |
| Jul 15, 2026 | 0.26% (0.00257) | 17.18th | v5 (v2026.06.15) |
References (2)
Change history (0)
No recorded changes yet.