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CVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

criticalknown exploitedCVE-2018-0173
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 Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).

CSIRTS triage

vendor: Ciscoproduct: IOS and IOS XE SoftwareDenial of service
What
A vulnerability can allow for denial-of-service in Cisco IOS and IOS XE Software.
Who is affected
Users of Cisco IOS and IOS XE Software.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest 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-2018-0173

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-2018-0173coverage & 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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