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CVE-2019-9518

HIGHCVSS 7.5/10EPSS 24.82%

Last modified

CVE-2019-9518 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 24.82% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
24.82%

97.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
AppleSwiftnio>= 1.0.0, <= 1.4.0
ApacheTraffic Server>= 6.0.0, <= 6.2.3
ApacheTraffic Server>= 7.0.0, <= 7.1.6
ApacheTraffic Server>= 8.0.0, <= 8.0.3
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux19.04
DebianDebian Linux9.0
DebianDebian Linux10.0
SynologySkynasAll versions
SynologyDiskstation Manager6.2
SynologyVs960hd FirmwareAll versions
FedoraprojectFedora29
FedoraprojectFedora30
OpensuseLeap15.0
OpensuseLeap15.1
RedhatJboss Core Services1.0
RedhatJboss Enterprise Application Platform7.2.0
RedhatJboss Enterprise Application Platform7.3.0
RedhatOpenshift Service Mesh1.0
RedhatQuay3.0.0
RedhatSoftware Collections1.0
RedhatEnterprise Linux8.0
OracleGraalvm19.2.0
McafeeWeb Gateway>= 7.7.2.0, < 7.7.2.24
McafeeWeb Gateway>= 7.8.2.0, < 7.8.2.13
McafeeWeb Gateway>= 8.1.0, < 8.2.0
NodejsNode.Js>= 8.0.0, <= 8.8.1
NodejsNode.Js>= 8.9.0, < 8.16.1
NodejsNode.Js>= 10.0.0, <= 10.12.0
NodejsNode.Js>= 10.13.0, < 10.16.3
NodejsNode.Js>= 12.0.0, < 12.8.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-9518?
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.
How severe is CVE-2019-9518?
CVE-2019-9518 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 24.82% probability of exploitation in the next 30 days.
How do I fix CVE-2019-9518?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9518?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST