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CVE-2019-9517

HIGHCVSS 7.5/10EPSS 27.89%

Last modified

CVE-2019-9517 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. EPSS estimates a 27.89% chance of exploitation in the next 30 days.

Description

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

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
27.89%

97.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
AppleSwiftnio>= 1.0.0, <= 1.4.0
ApacheHttp Server>= 2.4.20, < 2.4.40
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
OracleCommunications Element Manager8.0.0
OracleCommunications Element Manager8.1.0
OracleCommunications Element Manager8.1.1
OracleCommunications Element Manager8.2.0
OracleGraalvm19.2.0
OracleInstantis Enterprisetrack>= 17.1, <= 17.3
OracleRetail Xstore Point Of Service7.1
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
NetappClustered Data OntapAll versions
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-2019-9517?
Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.
How severe is CVE-2019-9517?
CVE-2019-9517 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 27.89% probability of exploitation in the next 30 days.
How do I fix CVE-2019-9517?
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-2019-9517?

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

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Source: NVD / NIST