CVE-2015-4638

What it is

The FastL4 virtual server in F5 BIG-IP LTM, AAM, AFM, Analytics, APM, ASM, GTM, Link Controller, and PEM 11.3.0 through 11.5.2 and 11.6.0 through 11.6.0 HF4, BIG-IP Edge Gateway, WebAccelerator, and WOM 11.2.1 through 11.3.0, and BIG-IP PSM 11.2.1 through 11.4.1 allows remote attackers to cause a denial of service (Traffic Management Microkernel restart) via a fragmented packet.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

1.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2015-09-18 14:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:27 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.7% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2015-09-18 14:59 UTC

Last modified

2026-06-17 00:27 UTC

Exploit probability

1.7% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• f5 big-ip Advanced Firewall Manager 11.3.0
• f5 big-ip Advanced Firewall Manager 11.4.0
• f5 big-ip Advanced Firewall Manager 11.4.1
• f5 big-ip Advanced Firewall Manager 11.5.0
• f5 big-ip Advanced Firewall Manager 11.5.1
• f5 big-ip Advanced Firewall Manager 11.5.2
• f5 big-ip Advanced Firewall Manager 11.6.0
• f5 big-ip Analytics 11.3.0

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2015-4638.md and follow it. Check whether this project is affected by CVE-2015-4638. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge