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CVE-2017-12231: Cisco IOS Software Network Address Translation Denial-of-Service Vulnerability

criticalknown exploitedCVE-2017-12231
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation 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

vendor: Ciscoproduct: IOS SoftwareDenial of service
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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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-03-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-12231

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2017-12231coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco IOS Software

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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