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No exploitation reportedFix available

CVE-2021-43565

No exploitation reported by the sources we read.

  • Published2022-09-06
  • Fixed in0.0.0-20211202192323-5770296d904e

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.

Timeline

dates in UTC
  1. 2022-09-0618:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-43565?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-43565?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Golang ssh
BranchAffectedFixed in
0.0< 0.0.0-20211202192323-5770296d904e0.0.0-20211202192323-5770296d904e

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2021-43565 Red Hat Product Security270 products fixed · 137 known affected

    golang.org/x/crypto: empty plaintext packet causes panic

    rhmtc/openshift-migration-velero-rhel8 as a component of Migration Toolkit for Containers · knative-eventing as a component of OpenShift Serverless · ior as a component of OpenShift Service Mesh 1 · +134 more

  • RHSA-2026:79243 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ceph Storage

  • RHSA-2024:2944 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: AMQ Broker 7.12.0.OPR.1.GA Container Images release and security update

  • RHSA-2022:8938 Red Hat Product Security108 products fixed

    Red Hat Security Advisory: Release of OpenShift Serverless 1.26.0

  • RHSA-2022:5069 Red Hat Product Security6 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.11.0 bug fix and security update

  • RHSA-2022:5068 Red Hat Product Security64 products fixed

    Red Hat Security Advisory: OpenShift Container Platform 4.11.0 packages and security update

10 more advisories

Full record on NVD

Fix

  1. Update Golang ssh to 0.0.0-20211202192323-5770296d904e
  2. Vendor fix Red Hat Product Security RHSA-2026:79243 · 4 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command.
  3. Vendor fix Red Hat Product Security RHSA-2024:2944 · 5 productsTo update to the latest image please refer to the AMQ container images in the Red Hat Container catalog.
  4. Vendor fix Red Hat Product Security RHSA-2022:8938 · 108 productsSee the Red Hat OpenShift Container Platform 4.8 documentation at: https://access.redhat.com/documentation/en-us/openshift_container_platform/4.8/html/serverless/index See the Red Hat OpenShift Container Platform 4.9 documentation at: https://access.redhat.com/documentation/en-us/openshift_containe…
  5. Vendor fix Red Hat Product Security RHSA-2022:5069 · 6 productsFor OpenShift Container Platform 4.11 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.11/release_notes/ocp-4-1…
  6. Vendor fix Red Hat Product Security RHSA-2022:5673 · 1 productOSP 16.2 Release - OSP Director Operator Containers tech preview
  7. Vendor fix Red Hat Product Security RHSA-2022:5201 · 221 productsFor Red Hat Advanced Cluster Management for Kubernetes, see the following documentation, which will be updated shortly for this release, for important instructions on installing this update: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.5/html-s…

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-09-06
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-43565?

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.

Is CVE-2021-43565 actively exploited?

Active exploitation of CVE-2021-43565 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-43565?

CVE-2021-43565 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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