How severe is CVE-2018-5518?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in F5 Big-Ip Access Policy Manager

CVE-2018-5518

On F5 BIG-IP 13.0.0-13.1.0.5 or 12.0.0-12.1.3.3, malicious root users with access to a VCMP guest can cause a disruption of service on adjacent VCMP guests running on the same host. Exploiting this vulnerability causes the vCMPd process on the adjacent VCMP guest to restart and produce a core file. This issue is only exploitable on a VCMP guest which is operating in "host-only" or "bridged" mode. VCMP guests which are "isolated" are not impacted by this issue and do not provide mechanism to exploit the vulnerability. Guests which are deployed in "Appliance Mode" may be impacted however the exploit is not possible from an Appliance Mode guest. To exploit this vulnerability root access on a guest system deployed as "host-only" or "bridged" mode is required.

Published 2018-05-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:A/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000

Affected products

References

support.f5.com/csp/article/K03165684 (Vendor Advisory)
www.securitytracker.com/id/1040797 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-5518?: CVE-2018-5518 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager. CVSS score: 5.4/10. Published 2018-05-02.
How severe is CVE-2018-5518?: Medium severity. CVSS v3 base score is 5.4 out of 10.