What is CVE-2018-0150?

CVE-2018-0150 is a critical-severity vulnerability in Cisco 4431 Integrated Services Router, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2018-03-28.

How severe is CVE-2018-0150?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-0150 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Cisco 4431 Integrated Services Router

CVE-2018-0150

A vulnerability in Cisco IOS XE Software could allow an unauthenticated, remote attacker to log in to a device running an affected release of Cisco IOS XE Software with the default username and password that are used at initial boot, aka a Static Credential Vulnerability. The vulnerability is due to an undocumented user account with privilege level 15 that has a default username and password. An attacker could exploit this vulnerability by using this account to remotely connect to an affected device. A successful exploit could allow the attacker to log in to the device with privilege level 15 access. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS XE Software Release 16.x. This vulnerability does not affect Cisco IOS XE Software releases prior to Release 16.x. Cisco Bug IDs: CSCve89880.

Published 2018-03-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.048 (91.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.048 · newest: 0.048 · change: -0.000

Affected products

Cisco 4431 Integrated Services Router
Cisco 4451 Integrated Services Router
Cisco iOS Xe — versions 16.5.1
Cisco iOS Xe — versions Cisco IOS XE

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

Public proof-of-concept exploits

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328… (Mitigation, Vendor Advisory)
www.securityfocus.com/bid/103539 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1040579 (VDB Entry, Third Party Advisory, Mitigation, vdb-entry)

Frequently asked questions

What is CVE-2018-0150?: CVE-2018-0150 is a critical-severity vulnerability in Cisco 4431 Integrated Services Router, classified under Use of Hard-coded Credentials. CVSS score: 9.8/10. Published 2018-03-28.
How severe is CVE-2018-0150?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-0150 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.