What is CVE-2018-0334?

CVE-2018-0334 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2018-06-07.

How severe is CVE-2018-0334?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Cisco Anyconnect Secure Mobility Client

CVE-2018-0334

A vulnerability in the certificate management subsystem of Cisco AnyConnect Network Access Manager and of Cisco AnyConnect Secure Mobility Client for iOS, Mac OS X, Android, Windows, and Linux could allow an unauthenticated, remote attacker to bypass the TLS certificate check when downloading certain configuration files. The vulnerability is due to improper use of Simple Certificate Enrollment Protocol and improper server certificate validation. An attacker could exploit this vulnerability by preparing malicious profile and localization files for Cisco AnyConnect to use. A successful exploit could allow the attacker to remotely change the configuration profile, a certificate, or the localization data used by AnyConnect Secure Mobility Client. Cisco Bug IDs: CSCvh23141.

Vulnerability class: Improper Certificate Validation

Published 2018-06-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.0th percentile), scored 2026-10-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Cisco Anyconnect Secure Mobility Client — versions 4.6(100), 4.6\(100\)
Cisco Anyconnect Secure Mobility Client Unknown — versions Cisco AnyConnect Secure Mobility Client unknown

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

www.securityfocus.com/bid/104430 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606… (Vendor Advisory)
www.securitytracker.com/id/1041075 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-0334?: CVE-2018-0334 is a medium-severity vulnerability in Cisco Anyconnect Secure Mobility Client, classified under Improper Certificate Validation. CVSS score: 4.8/10. Published 2018-06-07.
How severe is CVE-2018-0334?: Medium severity. CVSS v3 base score is 4.8 out of 10.