CVE-2026-20125
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,
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.
Weakness: CWE-228
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco IOS Software | Routing & Switching | cna-assigner |
| Cisco | Cisco IOS XE Software | Routing & Switching | cna-assigner |
Vendor-reported products (2)
- Cisco · IOS
- Cisco · Cisco IOS XE Software
Vendor advisory
cisco-sa-ios-http-dos-sbv8XRpL
Cisco IOS Software and IOS XE Software Release 3E HTTP Server Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 7.7) · Published Mar 25, 2026
Bug ID: CSCwq14981
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from