VDB-140009 · CVE-2019-9511 · RHSA-2019:2692

HTTP/2 Window Size Request 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.
6.7	$0-$5k	1.56

Summaryinfo

A vulnerability identified as critical has been detected in HTTP2. Affected by this issue is some unknown functionality of the component Window Size Handler. The manipulation as part of Request leads to resource consumption. This vulnerability is traded as CVE-2019-9511. It is possible to initiate the attack remotely. There is no exploit available. This vulnerability has a historic impact because of its background and how it was received. It is recommended to apply restrictive firewalling.

Detailsinfo

A vulnerability was found in HTTP2 (affected version not known) and classified as critical. This issue affects some unknown functionality of the component Window Size Handler. The manipulation as part of a Request leads to a resource consumption vulnerability. 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. The summary by CVE is:

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

The weakness was shared 08/13/2019 as confirmed advisory (CERT.org). The advisory is shared at kb.cert.org. The identification of this vulnerability is CVE-2019-9511 since 03/01/2019. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/15/2025). MITRE ATT&CK project uses the attack technique T1499 for this issue. Due to its background and reception, this vulnerability has a historic impact.

The vulnerability scanner Nessus provides a plugin with the ID 210459 (RHEL 7 : rh-nginx114-nginx (RHSA-2019:2775)), which helps to determine the existence of the flaw in a target environment.

Addressing this vulnerability is possible by firewalling .

The vulnerability is also documented in the vulnerability database at Tenable (210459). The entries VDB-139968, VDB-139969, VDB-139970 and VDB-139971 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

HTTP2

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector (CERT/CC): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 210459
Nessus Name: RHEL 7 : rh-nginx114-nginx (RHSA-2019:2775)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/01/2019 🔍
08/13/2019 +165 days 🔍
08/15/2019 +2 days 🔍
01/15/2025 +1980 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2692
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-9511 (🔍)
GCVE (CVE): GCVE-0-2019-9511
GCVE (VulDB): GCVE-100-140009
See also: 🔍

Entryinfo

Created: 08/15/2019 07:28
Updated: 01/15/2025 04:58
Changes: 08/15/2019 07:28 (58), 07/27/2020 18:34 (1), 11/25/2023 09:00 (4), 11/25/2023 09:02 (12), 11/07/2024 09:20 (17), 01/15/2025 04:58 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.