Cisco IOS up to 15.2(8)E5 Web UI improper validation of specified type of input

Summaryinfo

A vulnerability was found in Cisco IOS. It has been rated as critical. Impacted is an unknown function of the component Web UI. This manipulation causes improper validation of specified type of input. The identification of this vulnerability is CVE-2025-20327. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Cisco IOS and classified as critical. Affected by this vulnerability is an unknown function of the component Web UI. The manipulation with an unknown input leads to a improper validation of specified type of input vulnerability. The CWE definition for the vulnerability is CWE-1287. The product receives input that is expected to be of a certain type, but it does not validate or incorrectly validates that the input is actually of the expected type. As an impact it is known to affect availability. The summary by CVE is:

A vulnerability in the web UI of Cisco IOS Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper input validation. An attacker could exploit this vulnerability by sending a crafted URL in an HTTP request. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2025-20327 since 10/10/2024. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/24/2025).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS

Version

• 15.2(6)E2
• 15.2(6)E2a
• 15.2(6)E2b
• 15.2(6)E3
• 15.2(7)E
• 15.2(7)E0a
• 15.2(7)E0b
• 15.2(7)E0s
• 15.2(7)E1
• 15.2(7)E1a
• 15.2(7)E2
• 15.2(7)E2a
• 15.2(7)E3
• 15.2(7)E3k
• 15.2(7)E4
• 15.2(7)E5
• 15.2(7)E6
• 15.2(7)E7
• 15.2(7)E8
• 15.2(7)E9
• 15.2(7)E10
• 15.2(7a)E0b
• 15.2(7b)E0b
• 15.2(8)E
• 15.2(8)E1
• 15.2(8)E2
• 15.2(8)E3
• 15.2(8)E4
• 15.2(8)E5

License

• commercial

Website

• Vendor: https://www.cisco.com/

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