Read the docs
TI-2021-12745 Aliases CVE-2021-33197GHSA-wqr7-cf9q-rvf7

In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from…

Priority LOW 28CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Partial Red Hat: 22 fixed, 16 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-862.

Summary

In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.

Why it matters now

EPSS 0.0226 83rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 27 advisoriesRed Hat: 22 fixed, 16 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*before 1.15.13; 1.16.0 to before 1.16.5VulnerableGo standard library
  • cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* Versions before 1.15.13; 1.16.0 to before 1.16.5 Vulnerable ·Go standard library

Remediation

Red Hat 27 advisories

  • RHSA-2022:8008 Released 2022-11-15 · Red Hat rating Moderate
    buildah security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 9) buildah-1:1.27.0-2.el9, buildah-tests-1:1.27.0-2.el9
  • RHSA-2022:7954 Released 2022-11-15 · Red Hat rating Moderate
    podman security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 9) podman-2:4.2.0-3.el9, podman-docker-2:4.2.0-3.el9, podman-gvproxy-2:4.2.0-3.el9 +3
  • RHSA-2022:1402 Released 2022-04-19 · Red Hat rating Moderate
    OpenShift Virtualization 2.6.10 RPMs security and bug fix update
    • CNV 2.6 for RHEL 7 kubevirt-2.6.10-230.el7, kubevirt-virtctl-2.6.10-230.el7, kubevirt-virtctl-redistributable-2.6.10-230.el7
    • CNV 2.6 for RHEL 8 kubevirt-2.6.10-230.el8, kubevirt-virtctl-2.6.10-230.el8, kubevirt-virtctl-redistributable-2.6.10-230.el8
Show 24 more Red Hat advisories
  • RHSA-2022:1329 Released 2022-04-12 · Red Hat rating Moderate
    OpenShift Virtualization 4.8.5 RPMs security update
    • CNV 4.8 for RHEL 7 kubevirt-4.8.5-278.el7, kubevirt-virtctl-4.8.5-278.el7, kubevirt-virtctl-redistributable-4.8.5-278.el7
    • CNV 4.8 for RHEL 8 kubevirt-4.8.5-278.el8, kubevirt-virtctl-4.8.5-278.el8, kubevirt-virtctl-redistributable-4.8.5-278.el8
  • RHSA-2022:0577 Released 2022-03-28 · Red Hat rating Moderate
    Windows Container Support for Red Hat OpenShift 5.0.0 [security update]
    • Red Hat OpenShift Container Platform 4.10 openshift4-wincw/windows-machine-config-operator-bundle, openshift4-wincw/windows-machine-config-rhel8-operator
  • RHSA-2022:0947 Released 2022-03-16 · Red Hat rating Moderate
    OpenShift Virtualization 4.10.0 Images security and bug fix update
    • CNV 4.10 for RHEL 8 container-native-virtualization/hostpath-csi-driver, container-native-virtualization/hostpath-csi-driver-rhel8
  • RHSA-2022:0191 Released 2022-01-19 · Red Hat rating Moderate
    OpenShift Virtualization 4.9.2 Images security and bug fix update
    • CNV 4.9 for RHEL 8 container-native-virtualization/virt-cdi-importer
  • RHSA-2021:5086 Released 2021-12-13 · Red Hat rating Moderate
    Red Hat OpenShift Data Foundation 4.9.0 enhancement, security, and bug fix update
    • Red Hat OpenShift Data Foundation 4.9 on RHEL-8 odf/odf-multicluster-rhel8-operator, odf4/cephcsi-rhel8, odf4/ocs-must-gather-rhel8 +12
  • RHSA-2021:5085 Released 2021-12-13 · Red Hat rating Moderate
    Red Hat OpenShift Data Foundation 4.9.0 enhancement, security, and bug fix update
    • Red Hat OpenShift Data Foundation 4.9 on RHEL-8 mcg-5.9.0-28.61dcf87.5.9.el8
  • RHSA-2021:5072 Released 2021-12-09 · Red Hat rating Moderate
    Red Hat OpenStack Platform 16.1 (etcd) security update
    • Red Hat OpenStack Platform 16.1 etcd-3.3.23-3.1.el8ost.1
  • RHSA-2021:4226 Released 2021-11-09 · Red Hat rating Moderate
    grafana security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) grafana-7.5.9-4.el8
  • RHSA-2021:4156 Released 2021-11-09 · Red Hat rating Moderate
    go-toolset:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) delve-1.6.0-1.module+el8.5.0+10379+d6b83bd0.src::go-toolset:rhel8, delve-1.6.0-1.module+el8.5.0+10379+d6b83bd0.x86_64::go-toolset:rhel8, go-toolset-1.16.7-1.module+el8.5.0+12246+1aac4e3f.aarch64::go-toolset:rhel8 +18
  • RHSA-2021:4104 Released 2021-11-02 · Red Hat rating Moderate
    OpenShift Virtualization 4.9.0 Images security and bug fix update
    • CNV 4.9 for RHEL 8 container-native-virtualization/bridge-marker, container-native-virtualization/cluster-network-addons-operator, container-native-virtualization/cnv-containernetworking-plugins +24
  • RHSA-2021:3820 Released 2021-10-19 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.15 packages and security update
    • Red Hat OpenShift Container Platform 4.8 butane-0.12.1-2.rhaos4.8.el8, jenkins-2.289.3.1633554819-1.el8
  • RHSA-2021:3759 Released 2021-10-18 · Red Hat rating Moderate
    OpenShift Container Platform 4.9.0 bug fix and security update
    • Red Hat OpenShift Container Platform 4.9 openshift4/ose-baremetal-rhel8-operator, openshift4/ose-console, openshift4/ose-etcd +4
  • RHSA-2021:3598 Released 2021-09-21 · Red Hat rating Moderate
    OpenShift Virtualization 4.8.2 Images security and bug fix update
    • CNV 4.8 for RHEL 8 container-native-virtualization/vm-import-operator-rhel8
  • RHSA-2021:3556 Released 2021-09-16 · Red Hat rating Moderate
    Release of OpenShift Serverless 1.17.0
    • Red Hat OpenShift Serverless 1.17 openshift-serverless-1/client-kn-rhel8, openshift-serverless-1/eventing-apiserver-receive-adapter-rhel8, openshift-serverless-1/eventing-controller-rhel8 +27
  • RHSA-2021:3555 Released 2021-09-16 · Red Hat rating Moderate
    Release of OpenShift Serverless Client kn 1.17.0
    • Red Hat OpenShift Serverless 1.0 openshift-serverless-clients-0.23.2-1.el8
  • RHSA-2021:3487 Released 2021-09-15 · Red Hat rating Moderate
    Red Hat OpenStack Platform 16.2 (etcd) security update
    • Red Hat OpenStack Platform 16.2 etcd-3.3.23-3.1.el8ost.1
  • RHSA-2021:3431 Released 2021-09-07 · Red Hat rating Moderate
    go-toolset-1.15-golang security update
    • Red Hat Developer Tools for Red Hat Enterprise Linux Server (v. 7) go-toolset-1.15-golang-1.15.14-2.el7_9, go-toolset-1.15-golang-bin-1.15.14-2.el7_9, go-toolset-1.15-golang-docs-1.15.14-2.el7_9 +4
    • Red Hat Developer Tools for Red Hat Enterprise Linux Workstation (v. 7) go-toolset-1.15-golang-1.15.14-2.el7_9, go-toolset-1.15-golang-bin-1.15.14-2.el7_9, go-toolset-1.15-golang-docs-1.15.14-2.el7_9 +4
  • RHSA-2021:3248 Released 2021-08-31 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.9 packages and security update
    • Red Hat OpenShift Container Platform 4.8 containernetworking-plugins-0.8.6-3.rhaos4.6.el7, cri-tools-1.21.0-3.el8, golang-github-prometheus-promu-0.5.0-4.git642a960.el8 +1
  • RHSA-2021:3361 Released 2021-08-31 · Red Hat rating Moderate
    Migration Toolkit for Containers (MTC) 1.5.1 security and bug fix update
    • 8Base-RHMTC-1.5 rhmtc/openshift-migration-must-gather-rhel8, rhmtc/openshift-migration-registry-rhel8, rhmtc/openshift-migration-velero-plugin-for-microsoft-azure-rhel8 +2
  • RHSA-2021:3229 Released 2021-08-19 · Red Hat rating Moderate
    Red Hat OpenShift Jaeger 1.20.5 security update
    • Red Hat OpenShift Jaeger 1.20 distributed-tracing/jaeger-agent-rhel8, distributed-tracing/jaeger-all-in-one-rhel8, distributed-tracing/jaeger-collector-rhel8 +3
  • RHSA-2021:3146 Released 2021-08-12 · Red Hat rating Moderate
    ACS 3.64 security and enhancement update
    • RHACS 3.64 for RHEL 8 advanced-cluster-security/rhacs-rhel8-operator
  • RHSA-2021:3009 Released 2021-08-12 · Red Hat rating Moderate
    OpenShift Container Platform 4.6.42 security update
    • Red Hat OpenShift Container Platform 4.6 ignition-2.6.0-8.rhaos4.6.git947598e.el8, ignition-validate-2.6.0-8.rhaos4.6.git947598e.el8
  • RHSA-2021:2983 Released 2021-08-10 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.4 bug fix and security update
    • Red Hat OpenShift Container Platform 4.8 openshift4/egress-router-cni-rhel8, openshift4/network-tools-rhel8, openshift4/ose-aws-ebs-csi-driver-rhel8 +47
  • RHSA-2021:2984 Released 2021-08-10 · Red Hat rating Moderate
    OpenShift Container Platform 4.8.4 bug fix and security update
    • Red Hat OpenShift Container Platform 4.8 cri-o-1.21.2-8.rhaos4.8.git8d4264e.el7, cri-o-1.21.2-8.rhaos4.8.git8d4264e.el8, ignition-2.9.0-7.rhaos4.8.el8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
OpenShift ServerlessAffectedNo fix yet
OpenShift Service Mesh 2.0AffectedNo fix yet
Red Hat Ceph Storage 2AffectedNo fix planned: Out of support scope
Red Hat Ceph Storage 3AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat OpenShift Container Platform 3.11AffectedNo fix planned: Will not fix
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform Assisted Installer 1AffectedNo fix yet
Red Hat OpenShift Virtualization 2AffectedNo fix yet
Red Hat OpenShift Virtualization 4AffectedNo fix yet
Red Hat OpenStack Platform 16.1AffectedNo fix planned: Will not fix
Red Hat OpenStack Platform 16.2AffectedNo fix planned: Will not fix
Red Hat Openshift Container Storage 4AffectedNo fix yet
Red Hat Storage 3AffectedNo fix planned: Will not fix
Service Telemetry Framework 1.2 for RHEL 8AffectedNo fix planned: Will not fix
Service Telemetry Framework 1.3 for RHEL 8AffectedNo fix planned: Will not fix
8Base-RHMTC-1.5Fixed RHSA-2021:3361
CNV 2.6 for RHEL 7Fixed RHSA-2022:1402
CNV 2.6 for RHEL 8Fixed RHSA-2022:1402
CNV 4.8 for RHEL 7Fixed RHSA-2022:1329
CNV 4.8 for RHEL 8Fixed RHSA-2021:3598, RHSA-2022:1329
CNV 4.9 for RHEL 8Fixed RHSA-2021:4104, RHSA-2022:0191
RHACS 3.64 for RHEL 8Fixed RHSA-2021:3146
Red Hat Developer Tools for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:3431
Red Hat Developer Tools for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:3431
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:4156, RHSA-2021:4226
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2022:7954, RHSA-2022:8008
Red Hat OpenShift Container Platform 4.10Fixed RHSA-2022:0577
Red Hat OpenShift Container Platform 4.6Fixed RHSA-2021:3009
Red Hat OpenShift Container Platform 4.7Fixed—
Red Hat OpenShift Container Platform 4.8Fixed RHSA-2021:2983, RHSA-2021:2984, RHSA-2021:3248, RHSA-2021:3820
Red Hat OpenShift Container Platform 4.9Fixed RHSA-2021:3759
Red Hat OpenShift Data Foundation 4.9 on RHEL-8Fixed RHSA-2021:5085, RHSA-2021:5086
Red Hat OpenShift Jaeger 1.20Fixed RHSA-2021:3229
Red Hat OpenShift Serverless 1.0Fixed RHSA-2021:3555
Red Hat OpenShift Serverless 1.17Fixed RHSA-2021:3556
Red Hat OpenStack Platform 16.1Fixed RHSA-2021:5072
Red Hat OpenStack Platform 16.2Fixed RHSA-2021:3487
Not affected: 21 products
  • 7Server-RHMTC-1.5
  • 8Base-RHMTC-1.5
  • CNV 4.9 for RHEL 8
  • RHACS 3.64 for RHEL 8
  • Red Hat Ceph Storage 4
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • Red Hat OpenShift Container Platform 4.6
  • Red Hat OpenShift Container Platform 4.7
  • Red Hat OpenShift Container Platform 4.8
  • Red Hat OpenShift Container Platform 4.9
  • Red Hat OpenShift Jaeger 1.20
  • Red Hat OpenShift Virtualization 2
  • Red Hat OpenStack Platform 16.1
  • Red Hat OpenStack Platform 16.2
  • Red Hat Openshift Container Storage 4
  • Red Hat Quay 3
  • Red Hat Software Collections
  • Red Hat Storage 3
  • Service Telemetry Framework 1.3 for RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-33197
  2. 2026-10-03 Alias added: GHSA-wqr7-cf9q-rvf7

References

Exploit 1

Advisory 2

  • TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2018-05208 The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used… CVSS 3.1HIGH 8.8
  • TI-2018-12083 Improper input validation in [UNKNOWN] golang CVSS 3.1HIGH 8.1
  • TI-2024-16306 Mishandling of corrupt central directory record in archive/zip CVSS 3.1MEDIUM 5.5
  • TI-2021-15910 Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a… CVSS 3.1CRITICAL 9.8
See all 170 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences