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Vulnerability record · CVE-2019-9518 · published 13 August 2019

CVE-2019-9518: Apple swiftnio uncontrolled resource consumption vulnerability

Apple · Swiftnio

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.

7.5 CVSS 3.1 High EPSS 25% · top 2.1% CWE-400 · Uncontrolled resource consumptionCWE-770 · Allocation without limits
7.5CVSS 3.1 base score, v2 7.8
25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
18Affected product versions listed by NVD
54References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

18 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/16 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:2925 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2939 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2955 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3892 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4352 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0727 Third Party Advisory
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md Third Party Advisory
https://kb.cert.org/vuls/id/605641/ Third Party AdvisoryUS Government Resource
https://kc.mcafee.com/corporate/index?page=content&id=SB10296 Third Party Advisory
https://lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61%40%3Cusers.trafficserver.a
https://lists.apache.org/thread.html/2653c56545573b528f3f6352a29eccaf498bd6fb2a6a59568d81a61d%40%3Cannounce.trafficserve
https://lists.apache.org/thread.html/9317fd092b257a0815434b116a8af8daea6e920b6673f4fd5583d5fe%40%3Ccommits.druid.apache.
https://lists.apache.org/thread.html/ff5b0821a6985159a832ff6d1a4bd311ac07ecc7db1e2d8bab619107%40%3Cdev.trafficserver.apa
https://lists.apache.org/thread.html/r99a625fb17032646d96cd23dec49603ff630e9318e44a686d63046bc%40%3Ccommits.cassandra.ap
https://lists.apache.org/thread.html/rd31230d01fa6aad18bdadc0720acd1747e53690bd35f73a48e7a9b75%40%3Ccommits.cassandra.ap
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2F
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCG
https://seclists.org/bugtraq/2019/Aug/24 Mailing ListThird Party Advisory
https://seclists.org/bugtraq/2019/Sep/18 Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20190823-0005/ Third Party Advisory
https://support.f5.com/csp/article/K46011592 Third Party Advisory
https://support.f5.com/csp/article/K46011592?utm_source=f5support&amp%3Butm_medium=RSS
https://www.debian.org/security/2019/dsa-4520 Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_19_33 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html Mailing ListThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/16 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:2925 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2939 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2955 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3892 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4352 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0727 Third Party Advisory
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md Third Party Advisory
https://kb.cert.org/vuls/id/605641/ Third Party AdvisoryUS Government Resource
https://kc.mcafee.com/corporate/index?page=content&id=SB10296 Third Party Advisory
https://lists.apache.org/thread.html/091b518265bce56a16af87b77c8cfacda902a02079e866f9fdf13b61%40%3Cusers.trafficserver.a

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Source: NIST National Vulnerability Database (record CVE-2019-9518), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.