What is CVE-2018-5548?

CVE-2018-5548 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-09-13.

How severe is CVE-2018-5548?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Open Redirect in F5 Big-Ip Access Policy Manager

CVE-2018-5548

On BIG-IP APM 11.6.0-11.6.3, an insecure AES ECB mode is used for orig_uri parameter in an undisclosed /vdesk link of APM virtual server configured with an access profile, allowing a malicious user to build a redirect URI value using different blocks of cipher texts.

Vulnerability class: Open Redirect

Published 2018-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

F5 Big-Ip Access Policy Manager
F5 Networks, Inc. Big-Ip Apm — versions 11.6.0-11.6.3

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

support.f5.com/csp/article/K66171422 (Vendor Advisory)
sbudella.altervista.org/blog/20180911-cve-2018-5548.html (Technical Description, Exploit, Third Party Advisory)
www.securityfocus.com/bid/105353 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-5548?: CVE-2018-5548 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2018-09-13.
How severe is CVE-2018-5548?: Medium severity. CVSS v3 base score is 6.1 out of 10.