HTTP/2 Empty Frame resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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6.7$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in HTTP2. Impacted is an unknown function of the component Empty Frame Handler. Performing a manipulation results in resource consumption. This vulnerability was named CVE-2019-9518. The attack may be initiated remotely. There is no available exploit. This vulnerability is historically significant due to its background and the way it was received. It is suggested to use restrictive firewalling.

Detailsinfo

A vulnerability classified as critical has been found in HTTP2 (version now known). This affects some unknown processing of the component Empty Frame Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. The attacker sends a stream of frames with an empty payload and without the end-of-stream flag. These frames can be DATA, HEADERS, CONTINUATION and/or PUSH_PROMISE. The peer spends time processing each frame disproportionate to attack bandwidth. This can consume excess CPU.

The weakness was presented 08/13/2019 as not defined mailinglist post (Bugtraq). The advisory is shared at seclists.org. This vulnerability is uniquely identified as CVE-2019-9518 since 03/01/2019. It is possible to initiate the attack remotely. No form of authentication is needed for 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 01/12/2026). MITRE ATT&CK project uses the attack technique T1499 for this issue. Due to its background and reception, this vulnerability has a historic impact.

It is possible to mitigate the weakness by firewalling .

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2022-0770). See VDB-139968, VDB-139969, VDB-139970 and VDB-139971 for similar entries. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • IBM DB2
  • Red Hat Enterprise Linux
  • IBM SPSS
  • EMC Avamar
  • Hitachi Ops Center

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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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 🔍
01/12/2026 +2342 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2925
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-9518 (🔍)
GCVE (CVE): GCVE-0-2019-9518
GCVE (VulDB): GCVE-100-140013
CERT Bund: WID-SEC-2022-0770 - IBM DB2: Mehrere Schwachstellen

See also: 🔍

Entryinfo

Created: 08/15/2019 07:29
Updated: 01/12/2026 02:04
Changes: 08/15/2019 07:29 (57), 07/27/2020 18:56 (1), 11/25/2023 09:22 (4), 11/25/2023 09:23 (12), 01/15/2025 05:57 (16), 01/12/2026 02:04 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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