HTTP/2 Loop Request resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in HTTP2. This vulnerability affects unknown code of the component Loop Handler. This manipulation as part of Request causes resource consumption. This vulnerability is handled as CVE-2019-9513. The attack can be initiated remotely. There is not any exploit available. This vulnerability is considered historic because of its background and reception. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability was found in HTTP2 (the affected version is unknown). It has been declared as critical. Affected by this vulnerability is an unknown code of the component Loop Handler. The manipulation as part of a Request leads to a resource consumption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.

The weakness was released 08/13/2019 as confirmed advisory (CERT.org). It is possible to read the advisory at kb.cert.org. This vulnerability is known as CVE-2019-9513 since 03/01/2019. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/15/2025). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. 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.

Proper firewalling of is able to address this issue.

The vulnerability is also documented in the vulnerability database at Tenable (210459). Entries connected to this vulnerability are available at VDB-139968, VDB-139969, VDB-139970 and VDB-139971. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

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: 🔍

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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-2019-9513 (🔍)
GCVE (CVE): GCVE-0-2019-9513
GCVE (VulDB): GCVE-100-140011
See also: 🔍

Entryinfo

Created: 08/15/2019 07:29
Updated: 01/15/2025 04:58
Changes: 08/15/2019 07:29 (58), 07/27/2020 18:45 (1), 11/25/2023 09:08 (4), 11/25/2023 09:11 (12), 11/07/2024 09:20 (17), 01/15/2025 04:58 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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