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CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability

criticalknown exploitedCVE-2017-12240
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.
The Dynamic Host Configuration Protocol (DHCP) relay subsystem of Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system.

CSIRTS triage

vendor: Ciscoproduct: IOS and IOS XE SoftwareRemote code execution
What
A vulnerability in the DHCP relay subsystem allows remote attackers to execute arbitrary code.
Who is affected
Unauthenticated remote attackers can exploit this vulnerability in Cisco IOS and IOS XE Software.
Urgency
Remediation is critical due to the high severity and active exploitation.
Action
Update Cisco IOS and IOS XE Software to the latest version.

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-2017-12240

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-2017-12240coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco IOS and

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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