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CVE-2019-9516

MEDIUMCVSS 6.5/10EPSS 57.46%

Last modified

CVE-2019-9516 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. EPSS estimates a 57.46% chance of exploitation in the next 30 days.

Description

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
57.46%

99.0th 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
FedoraprojectFedora30
SynologySkynasAll versions
SynologyDiskstation Manager6.2
SynologyVs960hd FirmwareAll versions
FedoraprojectFedora29
FedoraprojectFedora32
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
F5Nginx>= 1.9.5, < 1.16.1
F5Nginx>= 1.17.0, <= 1.17.2
NodejsNode.Js>= 8.0.0, < 8.16.1
NodejsNode.Js>= 10.0.0, < 10.16.3
NodejsNode.Js>= 12.0.0, < 12.8.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-9516?
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
How severe is CVE-2019-9516?
CVE-2019-9516 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 57.46% probability of exploitation in the next 30 days.
How do I fix CVE-2019-9516?
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-2019-9516?

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

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Source: NVD / NIST