high
7.5
CWE
674 20 120
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-31525: Input Validation

First published: Thu Apr 22 2021(Updated: )

A vulnerability was detected in net/http of the Go standard library when parsing very large HTTP header values, causing a crash and subsequent denial of service. This vulnerability affects both clients and servers written in Go, however, servers are only vulnerable if the value of MaxHeaderBytes has been increased from the default.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
go/golang.org/x/net<0.0.0-20210428140749-89ef3d95e781
0.0.0-20210428140749-89ef3d95e781
redhat/heketi<0:10.4.0-2.el7
0:10.4.0-2.el7
redhat/openshift-serverless-clients<0:0.22.0-3.el8
0:0.22.0-3.el8
redhat/openshift-serverless-clients<0:0.23.2-1.el8
0:0.23.2-1.el8
redhat/ignition<0:2.9.0-4.rhaos4.7.git1d56dc8.el8
0:2.9.0-4.rhaos4.7.git1d56dc8.el8
redhat/cri-o<0:1.21.2-8.rhaos4.8.git8d4264e.el8
0:1.21.2-8.rhaos4.8.git8d4264e.el8
redhat/ignition<0:2.9.0-7.rhaos4.8.el8
0:2.9.0-7.rhaos4.8.el8
redhat/openshift<0:4.8.0-202107300027.p0.git.38b3ecc.assembly.stream.el8
0:4.8.0-202107300027.p0.git.38b3ecc.assembly.stream.el8
redhat/openshift-clients<0:4.8.0-202107292313.p0.git.1077b05.assembly.stream.el7
0:4.8.0-202107292313.p0.git.1077b05.assembly.stream.el7
redhat/containernetworking-plugins<0:0.8.6-3.rhaos4.6.el7
0:0.8.6-3.rhaos4.6.el7
redhat/cri-tools<0:1.21.0-3.el8
0:1.21.0-3.el8
redhat/golang-github-prometheus-promu<0:0.5.0-4.git642a960.el8
0:0.5.0-4.git642a960.el8
redhat/etcd<0:3.3.23-3.1.el8
0:3.3.23-3.1.el8
redhat/kubevirt<0:4.9.0-287.el8
0:4.9.0-287.el8
Golang Go<1.15.12
Golang Go>=1.16.0<1.16.4
Fedoraproject Fedora=34
IBM Cloud Pak for Security<=1.10.0.0 - 1.10.11.0
IBM QRadar Suite Software<=1.10.12.0 - 1.10.16.0
redhat/golang<1.17.0
1.17.0
redhat/golang<1.16.4
1.16.4
redhat/golang<1.15.12
1.15.12
<1.15.12
>=1.16.0<1.16.4
=34

Remedy

https://github.com/golang/go/issues/45710

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-31525?

    CVE-2021-31525 is a vulnerability in net/http of the Go standard library that allows remote attackers to cause a denial of service.

  • Which software is affected by CVE-2021-31525?

    The vulnerability affects net/http in Go before 1.15.12 and 1.16.x before 1.16.4.

  • How does CVE-2021-31525 impact servers?

    Servers written in Go are vulnerable to CVE-2021-31525 only if the value of MaxHeaderBytes has been increased, which is not the default configuration.

  • How can I fix CVE-2021-31525?

    To fix CVE-2021-31525, upgrade to Go version 1.15.12 or 1.16.4.

  • Where can I find more information about CVE-2021-31525?

    More information about CVE-2021-31525 can be found on the NIST National Vulnerability Database (NVD) and the official Go GitHub page.

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