CVE-2019-9512 | Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service

Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service. The attacker sends continual pings to an HTTP/2 peer, causing the peer to build an internal queue of responses. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

Published: 2019-08-13 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9512 is rated High Risk (69.9/100): CVSS High severity, with high exploitation likelihood (EPSS 83.43%, 100th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +32.61% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-9512

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 50.82% 83.43% +32.61%
2 2026-05-29 51.23% 50.82% -0.41%
3 2026-05-27 — 51.23% —

Full EPSS history (69 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9512

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2019-9512

GitHub Security Advisory for CVE-2019-9512

GHSA-hgr8-6h9x-f7q9 · Severity: high · Ecosystem: go — golang.org/x/net/http vulnerable to ping floods

OS Trackers for CVE-2019-9512

vendor priority summary link
alpine high CVE-2019-9512: 6 source package rows (containerd, go, h2o, k3s, nodejs, py3-twisted); 42 state rows across 17 repos (3.10-main, 3.11-main, 3.12-main, 3.17-community, 3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 42, open 0. https://security.alpinelinux.org/vuln/CVE-2019-9512
debian not yet assigned CVE-2019-9512 not yet assigned priority: Debian including 2 source packages (h2o, trafficserver), 5 status rows across 3 suites (bookworm, bullseye, sid): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-9512
redhat high — https://access.redhat.com/security/cve/CVE-2019-9512
suse high CVE-2019-9512 severity important: SUSE including 201 source package names (MozillaFirefox-68.2.0-78.51.4, MozillaFirefox-branding-SLED-68-21.9.8, …), 471 product×package rows across 53 product lines (SUSE CaaS Platform 3.0, SUSE CaaS Platform 4.0, … (53 product lines)): Fixed 346, Known Not Affected 125. https://www.suse.com/security/cve/CVE-2019-9512/
ubuntu medium CVE-2019-9512 medium priority: Ubuntu including 13 source packages (golang, golang-1.10, …), 238 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 130, not-affected 53, released 18, ignored 17, needs-triage 16, needed 4. https://ubuntu.com/security/CVE-2019-9512

Affected software / configurations for CVE-2019-9512

Vendor Product Version Raw CPE
apple swiftnio >= 1.0.0, <= 1.4.0 cpe:2.3:a:apple:swiftnio:*:*:*:*:*:*:*:*
apache traffic_server >= 6.0.0, <= 6.2.3 cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
apache traffic_server >= 7.0.0, <= 7.1.6 cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
apache traffic_server >= 8.0.0, <= 8.0.3 cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
nodejs node.js >= 8.0.0, <= 8.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 8.9.0, < 8.16.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 10.0.0, <= 10.12.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 10.13.0, < 10.16.3 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 12.0.0, < 12.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*

References for CVE-2019-9512

URL Tags
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
https://access.redhat.com/errata/RHSA-2019:2594 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2661 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2682 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2690 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2726 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2766 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2769 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2796 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2861 Third 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-2019:2966 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3131 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3245 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3265 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3892 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3906 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4018 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4019 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4020 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4021 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4040 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4041 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4042 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4045 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4269 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4273 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4352 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0406 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 Advisory US Government Resource
https://kc.mcafee.com/corporate/index?page=content&id=SB10296 Third Party Advisory
https://lists.apache.org/thread.html/392108390cef48af647a2e47b7fd5380e050e35ae8d1aa2030254c04%40%3Cusers.trafficserver.apache.org%3E
https://lists.apache.org/thread.html/ad3d01e767199c1aed8033bb6b3f5bf98c011c7c536f07a5d34b3c19%40%3Cannounce.trafficserver.apache.org%3E
https://lists.apache.org/thread.html/bde52309316ae798186d783a5e29f4ad1527f61c9219a289d0eee0a7%40%3Cdev.trafficserver.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/12/msg00011.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BBP27PZGSY6OP6D26E5FW4GZKBFHNU7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYO6E3H34C346D2E443GLXK7OK6KIYIQ/
https://seclists.org/bugtraq/2019/Aug/24 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Aug/31 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Aug/43 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Sep/18 Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20190823-0001/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20190823-0004/ Third Party Advisory
https://security.netapp.com/advisory/ntap-20190823-0005/ Third Party Advisory
https://support.f5.com/csp/article/K98053339 Third Party Advisory
https://support.f5.com/csp/article/K98053339?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/4308-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4503 Third Party Advisory
https://www.debian.org/security/2019/dsa-4508 Third Party Advisory
https://www.debian.org/security/2019/dsa-4520 Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_19_33 Third Party Advisory
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