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CVE-2019-9518
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service
High7.5EPSS 25.4%
- Published
- Updated
- Reserved
- Assigned by
- certcc
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| certccCNA (assigner) | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 25.4% · top 2.0% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
References (27)
- VU#605641 (opens in a new tab)third-party-advisoryx_refsource_CERT-VNx_transferred
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md (opens in a new tab)x_refsource_MISCx_transferred
- 20190814 APPLE-SA-2019-08-13-5 SwiftNIO HTTP/2 1.5.0 (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20190816 APPLE-SA-2019-08-13-5 SwiftNIO HTTP/2 1.5.0 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- https://www.synology.com/security/advisory/Synology_SA_19_33 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://support.f5.com/csp/article/K46011592 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [trafficserver-announce] 20190820 ATS is vulnerable to a HTTP/2 attack with empty frames (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [trafficserver-users] 20190820 ATS is vulnerable to a HTTP/2 attack with empty frames (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [trafficserver-dev] 20190820 ATS is vulnerable to a HTTP/2 attack with empty frames (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://security.netapp.com/advisory/ntap-20190823-0005/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- FEDORA-2019-5a6a7bc12c (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2019-6a2980de56 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-4520 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 20190910 [SECURITY] [DSA 4520-1] trafficserver security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- openSUSE-SU-2019:2114 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:2115 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296 (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2019:2925 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:2939 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:2955 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://support.f5.com/csp/article/K46011592?utm_source=f5support&%3Butm_medium=RSS (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2019:3892 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [druid-commits] 20191115 [GitHub] [incubator-druid] ccaominh opened a new pull request #8878: Address security vulnerabilities (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- RHSA-2019:4352 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2020:0727 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [cassandra-commits] 20210526 [jira] [Created] (CASSANDRA-16698) Security vulnerability CVE-2019-9518 for Netty (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [cassandra-commits] 20210526 [jira] [Updated] (CASSANDRA-16698) Security vulnerability CVE-2019-9518 for Netty (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2019-9518)Record last updated .