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HIGH severity

Improper Verification of Cryptographic Signature in golang.org/x/cryptoGHSA-ffhg-7mh4-33c4

HIGHFix: golang/crypto@bac4c82

GHSA-ffhg-7mh4-33c4 is a high-severity (CVSS 7.5) CWE-347 vulnerability in golang.org/x/crypto. 4 public exploit references exist, so weaponization risk is real. A fix is available for golang.org/x/crypto — see the affected versions and patch details below.

Also known asCVE-2020-9283GO-2020-0012
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
4 known
Exploitation data as of Oct 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
20.9%probability of exploitation in next 30 days
Moderate Risk+0.37%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
18.0%19.2%20.5%21.8%18.7%20.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-ffhg-7mh4-33c4 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹golang.org/x/crypto

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows a panic during signature verification in the golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts public keys. Also, a server can attack any SSH client.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogolang.org/x/cryptoall versions0.0.0-20200220183623-bac4c82f6975go get golang.org/x/crypto@v0.0.0-20200220183623-bac4c82f6975

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
9.0
Application
package sshgolang
1 version
0.0.0-20200220183623-bac4c82f6975
Exploits & PoCs
4

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-48121doslinux

Go SSH servers 0.0.2 - Denial of Service (PoC)

by Mark Adams · Feb 24, 2020

Exploit-DB Source

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/crypto, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update golang.org/x/crypto to 0.0.0-20200220183623-bac4c82f6975 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-ffhg-7mh4-33c4 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

OpenShift Container Platform uses the vulnerable library in a number of components but strictly as an SSH client. The severity of this vulnerability is reduced for clients as it requires connections to malicious SSH servers, with the maximum impact only a client crash. This vulnerability is rated Low for OpenShift…

ProductFixed inAdvisory
3scale API Management 2.10 on RHEL 73scale-amp2/3scale-rhel7-operator:1.13.0-17RHSA-2021:1129
Jaeger-1.17distributed-tracing/jaeger-agent-rhel7:1.17.6-1RHSA-2020:3370
OpenShift Service Mesh 1.0openshift-service-mesh/3scale-istio-adapter-rhel8:1.0.0-8RHSA-2020:3372
Openshift Service Mesh 1.1kiali-0:v1.12.10.redhat2-1.el7RHSA-2020:3369
Red Hat OpenShift Container Platform 4.3openshift-clients-0:4.3.31-202007250052.p0.git.3329.59998b9.el7RHBA-2020:3179
Red Hat OpenShift Container Platform 4.3openshift4/ose-azure-machine-controllers:v4.3.31-202007272153.p0RHBA-2020:3180
Red Hat OpenShift Container Platform 4.3openshift4/ose-sriov-dp-admission-controller:v4.3.37-202009151447.p0RHSA-2020:3809
Red Hat OpenShift Container Platform 4.4openshift4/ose-baremetal-rhel7-operator:v4.4.0-202006290400.p0RHSA-2020:2789

Frequently Asked Questions

golang.org/x/crypto before v0.0.0-20200220183623-bac4c82f6975 for Go allows a panic during signature verification in the golang.org/x/crypto/ssh package. A client can attack an SSH server that accepts public keys. Also, a server can attack any SSH client.
O3 Security · Impact-Aware SCA

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