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Varaxon Technologies

Known exploited vulnerability · CISA KEV

CVE-2017-12237: Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS and Cisco IOS XE could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service.

CVE-2017-12237

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2022-03-03: attackers are using it right now.

CISA KEV
Listed
Added 2022-03-03 · federal fix-by 2022-03-24
EPSS (30 days)
7.1%
Higher than 94% of CVEs · 2026-11-01
CVSS
No score

What CISA says

Cisco IOS and IOS XE Software Internet Key Exchange Denial-of-Service Vulnerability

Apply updates per vendor instructions.

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How to check if you are exposed to CVE-2017-12237

  1. Find every Cisco IOS and IOS XE Software system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2017-12237.

US federal agencies had to fix this by 2022-03-24. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

  1. · Added to CISA's Known Exploited Vulnerabilities catalog
  2. · Fix-by date for US federal agencies, passed 1,683 days ago

Weakness type

More exploited Cisco vulnerabilities

CISA lists 102 exploited Cisco vulnerabilities. The closest matches:

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Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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