What’s Vulnerable › Vulnerabilities

CVE-2019-12656: Cisco IOx Application Environment Denial of Service Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-09-25 · updated 2026-06-17
• Weakness: CWE-20

Description

A vulnerability in the IOx application environment of multiple Cisco platforms could allow an unauthenticated, remote attacker to cause the IOx web server to stop processing HTTPS requests, resulting in a denial of service (DoS) condition. The vulnerability is due to a Transport Layer Security (TLS) implementation issue. An attacker could exploit this vulnerability by sending crafted TLS packets 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 HTTPS requests, resulting in a DoS condition.

Affected products

• Cisco Cgr 1000 Firmware: all versions
• Cisco Ic3000 Firmware: all versions
• Cisco Ie 4000 Firmware: all versions
• Cisco Industrial Ethernet 2000 Switches 15.2(5.4.32i)E2: 15.2(6)e
• Cisco IOS: 1.6.0.0, 1.8.0
• Cisco Ir510 Wpan Firmware: all versions

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-iox
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190925-iox

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