CVE-2021-31525

lowpriority · track · 25EPSS 0.037 · 90 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

3.69% (90th) EPSS

CVSS 2.6 · low

Is it mine?

20 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

net/http in Go before 1.15.12 and 1.16.x before 1.16.4 allows remote attackers to cause a denial of service (panic) via a large header to ReadRequest or ReadResponse. Server, Transport, and Client can each be affected in some configurations.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedcontainer-native-virtualization/kubevirt-cpu-model-nfd-plugin@sha256:59070d43607b341ecaa9a65f999fed06ef03885035fa3deef0f2f3a7b9287d13_amd64 as a component of CNV 2.6 for RHEL 8redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:3733
Fixedcontainer-native-virtualization/kubevirt-cpu-node-labeller@sha256:11940ade61478e72b11faa3806967583c00779718206953e606025dd8a094c57_amd64 as a component of CNV 2.6 for RHEL 8redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:3733
Fixedcontainer-native-virtualization/kubevirt-kvm-info-nfd-plugin@sha256:6a4d596992e1b1a028756ed9d8c4b3acc6ef61bd510a890ab61d8ab35cbe3331_amd64 as a component of CNV 2.6 for RHEL 8redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:3733
Fixedcontainer-native-virtualization/vm-import-controller-rhel8@sha256:b0cdc6f7ce1e48a77fa1e1b683e386828dd9973872a03ac9f2a7c21efa0eef40_amd64 as a component of CNV 2.6 for RHEL 8redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:3733
Fixedcontainer-native-virtualization/vm-import-controller@sha256:b0cdc6f7ce1e48a77fa1e1b683e386828dd9973872a03ac9f2a7c21efa0eef40_amd64 as a component of CNV 2.6 for RHEL 8redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2021:3733

cvss

Technical severity, 0–10. One row per scoring source.

5.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.6–5.9

v2.02.6lowAV:N/AC:H/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 4.9 · impact 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 2.2 · impact 3.6

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Red Hat Product Security US

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-674USprimaryCWE-674USCWE-770US

affected products (20)

Products and version ranges known to be affected.

IBM DB2all versionscert_bundDEcpe:/a:ibm:db2:-
IBM DB2 On Openshift <11.5.7.0-cn5all versionscert_bundDE
IBM DB2 on Cloud Pak for Data <4.5.0all versionscert_bundDE
IBM MQall versionscert_bundDEcpe:/a:ibm:mq:-
IBM DB2≤ on Cloud Pak for Data <4.5.0cert_bundDE
IBM DB2≤ On Openshift <11.5.7.0-cn5cert_bundDE
n/a n/a≤ n/aenisa_euvdEU
fedoraproject fedora= 34nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
golang go< 1.15.12nvdUScpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
golang go1.16.0 → 1.16.4nvdUScpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
Bitnami golang< 1.15.12osvUSpkg:bitnami/golang
Bitnami golang1.16.0 → 1.16.4osvUSpkg:bitnami/golang
Go golang.org/x/net< 0.0.0-20210428140749-89ef3d95e781osvUSpkg:golang/golang.org/x/net
Go stdlib< 1.15.12osvUSpkg:golang/stdlib
Go stdlib1.16.0-0 → 1.16.4osvUSpkg:golang/stdlib
container-native-virtualization/kubevirt-cpu-model-nfd-plugin@sha256:59070d43607b341ecaa9a65f999fed06ef03885035fa3deef0f2f3a7b9287d13_amd64 as a component of CNV 2.6 for RHEL 8all versionsfixedredhat_csafUS
container-native-virtualization/kubevirt-cpu-node-labeller@sha256:11940ade61478e72b11faa3806967583c00779718206953e606025dd8a094c57_amd64 as a component of CNV 2.6 for RHEL 8all versionsfixedredhat_csafUS
container-native-virtualization/kubevirt-kvm-info-nfd-plugin@sha256:6a4d596992e1b1a028756ed9d8c4b3acc6ef61bd510a890ab61d8ab35cbe3331_amd64 as a component of CNV 2.6 for RHEL 8all versionsfixedredhat_csafUS
container-native-virtualization/vm-import-controller-rhel8@sha256:b0cdc6f7ce1e48a77fa1e1b683e386828dd9973872a03ac9f2a7c21efa0eef40_amd64 as a component of CNV 2.6 for RHEL 8all versionsfixedredhat_csafUS
container-native-virtualization/vm-import-controller@sha256:b0cdc6f7ce1e48a77fa1e1b683e386828dd9973872a03ac9f2a7c21efa0eef40_amd64 as a component of CNV 2.6 for RHEL 8all versionsfixedredhat_csafUS

advisories (6)

Vendor and ecosystem advisories describing this.

RHSA-2021:3733Red Hat Security Advisory: OpenShift Virtualization 2.6.7 Images security and bug fix update2021-10-06csaf · redhat_csafUS
Red Hat OpenShift Virtualization release 2.6.7 is now available with updates to packages and images that fix several bugs and add enhancements. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
WID-SEC-W-2022-0510IBM DB2: Mehrere SchwachstellenDeutsch2022-06-29csaf · cert_bundDE
Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in IBM DB2 ausnutzen, um Dateien zu manipulieren, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand auszulösen, willkürlichen Code mit erhöhten Rechten auszuführen, Informationen falsch darzustellen und beliebigen Code auszuführen.
WID-SEC-W-2023-2229Splunk Splunk Enterprise: Mehrere SchwachstellenDeutsch2023-08-30csaf · cert_bundDE
Ein entfernter, authentifizierter Angreifer kann mehrere Schwachstellen in Splunk Splunk Enterprise ausnutzen, um beliebigen Code auszuführen, einen 'Denial of Service'-Zustand zu verursachen, seine Privilegien zu erweitern und weitere, nicht spezifizierte Auswirkungen zu verursachen.
GHSA-h86h-8ppg-mxmhgolang.org/x/net/http/httpguts vulnerable to Uncontrolled Recursion2022-05-24ghsa · osvUS
golang.org/x/net/http/httpguts in Go before 1.15.12 and 1.16.x before 1.16.4 allows remote attackers to cause a denial of service (panic) via a large header to ReadRequest or ReadResponse. Server, Transport, and Client can each be affected in some configurations.
BIT-golang-2021-315252024-03-06vendor · osvUS
net/http in Go before 1.15.12 and 1.16.x before 1.16.4 allows remote attackers to cause a denial of service (panic) via a large header to ReadRequest or ReadResponse. Server, Transport, and Client can each be affected in some configurations.
GO-2022-0236Panic due to large headers in net/http and golang.org/x/net/http/httpguts2022-07-15vendor · osvUS
A malicious HTTP server or client can cause the net/http client or server to panic. ReadRequest and ReadResponse can hit an unrecoverable panic when reading a very large header (over 7MB on 64-bit architectures, or over 4MB on 32-bit ones). Transport and Client are vulnerable and the program can be made to crash by a malicious server. Server is not vulnerable by default, but can be if the default max header of 1MB is overridden by setting Server.MaxHeaderBytes to a higher value, in which case the program can be made to crash by a malicious client. This also affects golang.org/x/net/http2/h2c and HeaderValuesContainsToken in golang.org/x/net/http/httpguts.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd redhat_csaf NVD CVE.org MITRE

published 2021-05-27modified 2026-06-17

related (725)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2021-45105US	medium5.9	100.0% (100th)	Exploit	2021-12-18
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker wit…
CVE-2024-25111US	high7.5	65.3% (99th)	—	2024-03-06
Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable to a Denial of Service attack against HTTP Chunked decoder due to an uncont…
CVE-2021-42697US	high7.5	36.1% (98th)	Exploit	2021-11-02
Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service at…
CVE-2023-50269US	high7.5	57.6% (99th)	—	2023-12-14
Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may…
CVE-2009-3563US	medium6.4	32.1% (98th)	Exploit	2009-12-09
ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed…

+720 more

references (57)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan