Medium severity · published Jul 14, 2026
CVE-2025-62826
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…
4.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
FortiOS · Fortinet
7.6.0 through 7.6.2; 7.4.0 through 7.4.8; 7.2.0 through 7.2.13; 7.0.0 through 7.0.19; 6.4.0 through 6.4.16 · source: vendor, NVD
FO
FortiPAM · Fortinet
1.7.0; 1.6.0 through 1.6.2; 1.5.0 through 1.5.1; 1.4.0 through 1.4.3; 1.3.0 through 1.3.1; 1.2.0; +2 more · source: vendor
FO
FortiProxy · Fortinet
7.6.0 through 7.6.4; 7.4.0 through 7.4.14; 7.2.0 through 7.2.16; 7.0.0 through 7.0.23 · source: vendor, NVD
RA
RUGGEDCOM APE1808 · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-62826
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-62826
Vendor Advisory
https://fortiguard.fortinet.com/psirt/FG-IR-26-153
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-864900.html
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