High 7.5Published Aug 13, 2019

CVE-2019-9514Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service.

Updated under an hour ago (Nov 2, 2026, 12:23 AM ET)

Does this affect you?

It affects apple swiftnio and 27 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stackFree account, 3 products Every CVE for apple swiftnio Exploited in the last 30 days

Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. The attacker opens a number of streams and sends an invalid request over each stream that should solicit a stream of RST_STREAM frames from the peer. Depending on how the peer queues the RST_STREAM frames, this can consume excess memory, CPU, or both.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apple swiftnio apple:swiftnio	from 1.0.0 through 1.4.0	NVD
apache traffic_server apache:traffic_server	from 6.0.0 through 6.2.3; from 7.0.0 through 7.1.6; from 8.0.0 through 8.0.3	NVD
debian debian_linux debian:debian_linux	10.0; 9.0; 10.0	NVD
canonical ubuntu_linux canonical:ubuntu_linux	16.04; 18.04; 19.04	NVD
synology skynas synology:skynas	all versions	NVD
synology diskstation_manager synology:diskstation_manager	6.2	NVD
synology vs960hd_firmware synology:vs960hd_firmware	all versions	NVD
fedoraproject fedora fedoraproject:fedora	29; 30	NVD
opensuse leap opensuse:leap	15.0; 15.1	NVD
redhat developer_tools redhat:developer_tools	1.0	NVD
1–10 of 28

References

References

http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00076.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00002.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00011.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00021.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00038.html	mailing-list, third-party-advisory
http://seclists.org/fulldisclosure/2019/Aug/16	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2019/08/20/1	mailing-list, third-party-advisory
http://www.openwall.com/lists/oss-security/2023/10/18/8
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.