F5 BIG-IP up to Virtual Server HPACK Bomb resource consumption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.

A vulnerability was found in F5 BIG-IP up to (Firewall Software). It has been rated as problematic. Affected by this issue is an unknown function of the component Virtual Server. The manipulation with an unknown input leads to a resource consumption vulnerability (HPACK Bomb). Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

F5 BIG-IP 13.0.0-, 12.1.0-, or 11.6.0- virtual servers with HTTP/2 profiles enabled are vulnerable to "HPACK Bomb".

The bug was discovered 07/25/2018. The weakness was disclosed 07/25/2018 (Website). The advisory is shared for download at support.f5.com. This vulnerability is handled as CVE-2018-5530 since 01/11/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 118667 (F5 Networks BIG-IP : TMM vulnerability (K45611803)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family F5 Networks Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 371104 (F5 BIG-IP ASM TMM denial of service vulnerability (K45611803)).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118667). The entries 122193 and 122195 are pretty similar.







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍


VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Name: HPACK Bomb
Class: Resource consumption / HPACK Bomb
CWE: CWE-400 / CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 118667
Nessus Name: F5 Networks BIG-IP : TMM vulnerability (K45611803)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍


01/11/2018 🔍
07/24/2018 +193 days 🔍
07/25/2018 +0 days 🔍
07/25/2018 +0 days 🔍
07/25/2018 +0 days 🔍
07/25/2018 +0 days 🔍
07/26/2018 +1 days 🔍
11/02/2018 +99 days 🔍
04/25/2023 +1635 days 🔍


Vendor: f5.com

Advisory: K45611803
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-5530 (🔍)
SecurityFocus: 104908 - Multiple F5 BIG-IP Products CVE-2018-5530 Denial of Service Vulnerability

See also: 🔍


Created: 07/26/2018 07:50 AM
Updated: 04/25/2023 04:55 PM
Changes: 07/26/2018 07:50 AM (69), 03/10/2020 10:29 AM (6), 04/25/2023 04:55 PM (4)
Complete: 🔍


No comments yet. Languages: en.

Please log in to comment.

Do you need the next level of professionalism?

Upgrade your account now!