CVE-2019-12656

HIGH

Cisco IOS - Unauthenticated Denial of Service via TLS Packet Handling

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0182
EPSS Percentile 76.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (7)
cisco/cgr_1000_firmware
cisco/ic3000_firmware
cisco/ie_4000_firmware
cisco/industrial_ethernet_2000_series_firmware 15.2\(6\)e
cisco/ios 1.6.0.0
cisco/ios 1.8.0
cisco/ir510_wpan_firmware
Published Sep 25, 2019
Tracked Since Feb 18, 2026