Is CVE-2018-0257 being actively exploited?

CVE-2018-0257 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-0257?

CVE-2018-0257 has a CVSS 3.0 base score of 4.3 (MEDIUM).

CVE-2018-0257

MEDIUM · CVSS 4.3EPSS 0.8%EU EUVD

A vulnerability in Cisco IOS XE Software running on Cisco cBR Series Converged Broadband Routers could allow an unauthenticated, adjacent attacker to cause high CPU usage on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to the incorrect handling of certain DHCP packets. An attacker could exploit this vulnerability by sending certain DHCP packets to a specific segment of an affected device. A successful exploit could allow the attacker to increase CPU usage on the affected device and cause a DoS condition. Cisco Bug IDs: CSCvg73687.

Key facts

CVSS score: 4.3 (v3.0)
Severity: MEDIUM
CVSS vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-399
EPSS score: 0.8% (55th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-1080)
Published: April 19, 2018
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-1080 in the EU Vulnerability Database. Last updated in EUVD on November 29, 2024.

View on the EU Vulnerability Database

Affected products

cisco / ios xe
cisco / ios xe
cisco / ios xe
cisco / ios xe

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

Cisco Catalyst 9400 Series Switches running IOS-XE 16.6 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10863-2018 - archived

References

http://www.securityfocus.com/bid/103948(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1040716(Third Party Advisory, VDB Entry)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-cbr8(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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