CVE-2018-0172

high-risk
Published 2018-03-28

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.

Do I need to act?

~
6.2% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.6/10 High
NETWORK / LOW complexity

Affected Products (2)

Ios

Affected Vendors

Cisco

References (13)

Third Party Advisory http://www.securityfocus.com/bid/103552
Third Party Advisory http://www.securitytracker.com/id/1040591
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Vendor Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2...
Third Party Advisory https://www.tenable.com/security/research/tra-2018-06
Third Party Advisory http://www.securityfocus.com/bid/103552
Third Party Advisory http://www.securitytracker.com/id/1040591
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
Third Party Advisory https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Vendor Advisory https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2...
Third Party Advisory https://www.tenable.com/security/research/tra-2018-06
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-...
52
/ 100
high-risk
Severity 29/34 · Critical
Exploitability 16/34 · Moderate
Exposure 7/34 · Low