EUVD-2026-15449CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
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Description
A vulnerability in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE Software Release 3E could allow an authenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending malformed HTTP requests to an affected device. A successful exploit could allow the attacker to cause a watchdog timer to expire and the device to reload, resulting in a DoS condition. To exploit this vulnerability, the attacker must have a valid user account.
Analysis
HTTP Server input validation failures in Cisco IOS and IOS XE Release 3E enable authenticated remote attackers to trigger device reloads via malformed requests, causing denial of service. An attacker with valid credentials can exploit improper input handling to exhaust watchdog timers and force unexpected system restarts. …
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Remediation
Within 24 hours: Inventory all Cisco IOS/IOS XE devices and identify which are running vulnerable versions listed in ENISA EUVD-2026-15449. Within 7 days: Implement network access controls to restrict HTTP server access to trusted administrative networks only; disable HTTP if HTTPS alternatives exist. …
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