CVE-2018-5517 Denial of service in BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, Edge Gateway, GTM, Link Controller, PEM, WebAccelerator, WebSafe)

High 7.5 Published 2 May 2018 Updated 17 Sep 2024

Malformed TCP packets can cause service interruption on F5 BIG-IP data plane virtual servers and self IPs.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-5517?

CVE-2018-5517 is a high-severity denial of service vulnerability in F5 Big-Ip Access Policy Manager, published on 2 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On F5 BIG-IP 13.1.0-13.1.0.5, malformed TCP packets sent to a self IP address or a FastL4 virtual server may cause an interruption of service. The control plane is not exposed to this issue. This issue impacts the data plane virtual servers and self IPs.

Weakness: CWE-20

Which versions are affected by CVE-2018-5517?

It affects 13 products.

Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager, F5 Big-Ip Domain Name System and 7 more.

How do I fix CVE-2018-5517?

No fix has been published for CVE-2018-5517 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-5517 being exploited?

There is no known exploitation of CVE-2018-5517 in the wild and no public exploit code.

All F5 Big-Ip Access Policy Manager vulnerabilities

Sources

Also known as GHSA-cmj6-4pjx-ghf8.