CISA-confirmed known exploited vulnerability

CVE-2017-12232

Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability

Cisco · IOS software

Vulnerability details

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service.

Added to CISA KEV: 2022-03-03

Ransomware campaign use: Unknown

CISA due date: 2022-03-24

Defensive guidance from CISA

Apply updates per vendor instructions.

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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