CVE-2021-1460: Cisco IOx Application Framework Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-24 · updated 2026-06-17
Weakness: CWE-400

Description

A vulnerability in the Cisco IOx Application Framework of Cisco 809 Industrial Integrated Services Routers (Industrial ISRs), Cisco 829 Industrial ISRs, Cisco CGR 1000 Compute Module, and Cisco IC3000 Industrial Compute Gateway could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling during packet processing. An attacker could exploit this vulnerability by sending a high and sustained rate of crafted TCP traffic to the IOx web server on an affected device. A successful exploit could allow the attacker to cause the IOx web server to stop processing requests, resulting in a DoS condition.

Affected products

Cisco Cgr1000 Firmware: before 1.12.0.3 — fixed in 1.12.0.3
Cisco IC3000 Industrial Compute Gateway: before 1.3.2 — fixed in 1.3.2
Cisco IOS: before 15.9\(3\)m3 — fixed in 15.9\(3\)m3

How to fix

Upgrade to a fixed version: Cisco Cgr1000 Firmware 1.12.0.3; Cisco IC3000 Industrial Compute Gateway 1.3.2; Cisco IOS 15.9\(3\)m3. Check the vendor advisory for mitigations.

References

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