Is CVE-2018-0172 in the CISA KEV catalog?

Yes. CVE-2018-0172 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-03.

What is the CVSS severity of CVE-2018-0172?

CVE-2018-0172 has a CVSS v3 base score of 8.6 (HIGH).

What is the EPSS score for CVE-2018-0172?

CVE-2018-0172 has an EPSS score of 7.82% (94th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2018-0172

HIGHCISA KEVEPSS 94th pctl

8.6

CVSS v3

NVD

Description

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.

CWE-20Improper Input Validation CWE-787Out-of-bounds Write

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

7.82%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow for denial-of-service (DoS).

Apply updates per vendor instructions.

Remediation due: 2022-03-17

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-14.