CVE-2017-12231
Actively exploited. CVE-2017-12231 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
A vulnerability in the implementation of Network Address Translation (NAT) functionality in Cisco IOS could allow an unauthenticated, remote attacker to cause a denial of service.
CSIRTS triage
- What
- A vulnerability in the implementation of Network Address Translation (NAT) functionality could allow an unauthenticated, remote attacker to cause a denial of service.
- Who is affected
- Unauthenticated remote attackers can exploit this vulnerability on Cisco IOS devices.
- Urgency
- Remediation is critical due to the severity of the vulnerability and confirmed exploitation.
- Action
- Implement the latest security updates from Cisco.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 93% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2017-12231: Cisco IOS Software Network Address Translation Denial-of-Service Vulnerabilitycisa-kev · 2022-03-03
External references
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