CVE-2019-9511

high-risk
Published 2019-08-13

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.

Do I need to act?

!
13.9% chance of exploitation in next 30 days
EPSS score — higher than 86% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Debian Redhat Apache Apple Oracle F5 Mcafee Canonical Fedoraproject Opensuse Synology Nodejs

References (94)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html
Mailing List http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2692
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2745
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2746
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2775
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:2799
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-2019:2949
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-2019:3041
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3932
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3933
Third Party Advisory https://access.redhat.com/errata/RHSA-2019:3935
and 74 more references
60
/ 100
high-risk
Severity 26/34 · High
Exploitability 12/34 · Low
Exposure 22/34 · High