What is CVE-2018-0087?

CVE-2018-0087 is a medium-severity vulnerability in Cisco Asyncos, classified under Improper Authentication. CVSS score: 5.6/10. Published 2018-03-08.

How severe is CVE-2018-0087?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Auth bypass in Cisco Asyncos

CVE-2018-0087

A vulnerability in the FTP server of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to log in to the FTP server of the device without a valid password. The attacker does need to have a valid username. The vulnerability is due to incorrect FTP user credential validation. An attacker could exploit this vulnerability by using FTP to connect to the management IP address of the targeted device. A successful exploit could allow the attacker to log in to the FTP server of the Cisco WSA without having a valid password. This vulnerability affects Cisco AsyncOS for WSA Software on both virtual and hardware appliances that are running any release of Cisco AsyncOS 10.5.1 for WSA Software. The device is vulnerable only if FTP is enabled on the management interface. FTP is disabled by default. Cisco Bug IDs: CSCvf74281.

Vulnerability class: Broken Authentication

Published 2018-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.018 (78.2th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Cisco Asyncos — versions 10.5.1-296
Cisco Web Security Appliance — versions Cisco Web Security Appliance

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

www.securityfocus.com/bid/103407 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307… (Vendor Advisory)
www.securitytracker.com/id/1040464 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-0087?: CVE-2018-0087 is a medium-severity vulnerability in Cisco Asyncos, classified under Improper Authentication. CVSS score: 5.6/10. Published 2018-03-08.
How severe is CVE-2018-0087?: Medium severity. CVSS v3 base score is 5.6 out of 10.