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    CVE-2025-6999

    An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected self-Cross-Site Scripting (XSS) attack. WatchGuard does not believe there is a practical exploit chain with a meaningful security impact for this vulnerability.

    Published:Sep 15, 2025
    Last Modified:Aug 10, 2026
    EPS:Sep 15, 2025
    EPSS Score:0.0052
    CVSS Score:6.9

    Affected Products

    Vendor
    Watchguard
    Product
    Fireware
    Vendor
    Watchguard
    Product
    Fireware Os

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-13050 (CVSS 8.6) — An Out-of-bounds Write vulnerability in WatchGuard Fireware OS networkd process could allow an authenticated p…
    CVE-2026-8247 (CVSS 7.7) — An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow an unauthenticated attacker on the sa…
    CVE-2026-13084 (CVSS 8.7) — A null pointer dereference vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker…
    CVE-2026-13368 (CVSS 9.2) — WatchGuard Fireware OS contains a race condition leading to a use-after-free vulnerability in LDAP authenticat…
    CVE-2026-13722 (CVSS 8.6) — WatchGuard Fireware OS contains a firmware validation bypass when processing a backup image via the backup/res…
    CVE-2026-13371 (CVSS 6.9) — An authenticated administrator can trigger a denial-of-service condition in the Fireware Management Web UI by …
    CVE-2026-3987 (CVSS 8.6) — A path traversal vulnerability in the Fireware OS Web UI on WatchGuard Firebox systems may allow a privileged …
    CVE-2026-4315 (CVSS 7.1) — A Cross-Site Request Forgery (CSRF) vulnerability in the WatchGuard Fireware OS WebUI could allow a remote att…
    CVE-2026-4266 (CVSS 8.4) — An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write…
    CVE-2026-3344 (CVSS 6.9) — A vulnerability in WatchGuard Fireware OS may allow an attacker to bypass the Fireware OS filesystem integrity…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High