CVE-2018-0173
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 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.
ACTIVELY EXPLOITED IN THE WILD
This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
Cisco IOS and IOS XE Software
Apply updates per vendor instructions.
3/3/2022
https://nvd.nist.gov/vuln/detail/CVE-2018-0173
Vulnerability Summary
CVSS v3 Score
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v2 Score
AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS Score (Exploitation Probability)
This vulnerability has a 5.42% probability of being exploited in the next 30 days, ranking higher than 90% of all scored CVEs.
CWE Classification
Related Vulnerabilities
Same Weakness Type(CWE-20)
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Similar SeverityHIGH
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