CVE-2019-9518

Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service

HIGH
7.5
CVSS Score
Published: August 13, 2019 at 08:50 PM UTC
Updated: June 17, 2026 at 02:43 AM UTC
20 products affected across 11 vendorsDebian LinuxFedoraUbuntu Linux

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Severity
HIGH7.5
Exploit prediction
EPSS 25%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

6.0.0 ≤ v ≤ 6.2.37.0.0 ≤ v ≤ 7.1.68.0.0 ≤ v ≤ 8.0.3
1.0.0 ≤ v ≤ 1.4.0
apple-macos (environment) · canonical-ubuntu-linux (environment)
7.7.2.0 ≤ v < 7.7.2.247.8.2.0 ≤ v < 7.8.2.138.1.0 ≤ v < 8.2.0
Affected range stops below 7.7.2.24, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.8.2.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.2.0, so it looks safe — our inference, not a vendor statement
10.0.0 ≤ v ≤ 10.12.010.13.0 ≤ v < 10.16.312.0.0 ≤ v < 12.8.18.0.0 ≤ v ≤ 8.8.18.9.0 ≤ v < 8.16.1
Affected range stops below 10.16.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.8.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement

References (27)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
Mailing Listx_refsource_FULLDISCThird Party Advisory
http://seclists.org/fulldisclosure/2019/Aug/16
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:2925
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:2939
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:2955
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:3892
Vendor Advisoryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/errata/RHSA-2019:4352

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400CWE-770

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