CVE-2019-9511
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 59.5%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 59.55% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-770
- Affected
- apple/swiftnio · apache/traffic server · canonical/ubuntu linux · debian/debian linux · synology/skynas · synology/diskstation manager · synology/vs960hd firmware · fedoraproject/fedora · opensuse/leap · redhat/jboss core services · redhat/jboss enterprise application platform · redhat/openshift service mesh · redhat/quay · redhat/software collections · redhat/enterprise linux · oracle/graalvm · mcafee/web gateway · f5/nginx · oracle/enterprise communications broker · nodejs/node.js
- Source
- cret@cert.org
EPSS 59.5% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.htmlMailing List, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2692Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2745Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2746Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2775Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2799Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2925Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2939Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2949Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2955Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:2966Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3041Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3932Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3933Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3935Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4018Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4019Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4020Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4021Third Party Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.mdThird Party Advisory
- https://kb.cert.org/vuls/id/605641/Third Party Advisory, US Government Resource
- https://kc.mcafee.com/corporate/index?page=content&id=SB10296Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.