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HIGH severity

CVE-2020-24359 — vault-ssh-helper

HIGHFix: hashicorp/vault-ssh-helper@83effd0

CVE-2020-24359 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in github.com/hashicorp/vault-ssh-helper. A fix is available for github.com/hashicorp/vault-ssh-helper — see the affected versions and patch details below.

Improper Input Validation in vault-ssh-helper

Also known asGHSA-f9fq-vjvh-779pGO-2022-0824
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs63th percentile — riskier than 63% of all scored CVEsHighest risk
0.00%0.51%1.02%1.54%0.2%1.0%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2020-24359 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/hashicorp/vault-ssh-helper

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

HashiCorp vault-ssh-helper (github.com/hashicorp/vault-ssh-helper/helper) up to and including version 0.1.6 incorrectly accepted Vault-issued SSH OTPs for the subnet in which a host's network interface was located, rather than the specific IP address assigned to that interface. Fixed in 0.2.0.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/hashicorp/vault-ssh-helperall versions0.2.0go get github.com/hashicorp/vault-ssh-helper@v0.2.0

Affected Products

1 product · 1 configurations
Application
vault-ssh-helperhashicorp
< 0.2.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/hashicorp/vault-ssh-helper, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/hashicorp/vault-ssh-helper to 0.2.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-24359 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.

Frequently Asked Questions

HashiCorp vault-ssh-helper (github.com/hashicorp/vault-ssh-helper/helper) up to and including version 0.1.6 incorrectly accepted Vault-issued SSH OTPs for the subnet in which a host's network interface was located, rather than the specific IP address assigned to that interface. Fixed in 0.2.0.
O3 Security · Impact-Aware SCA

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CVE-2020-24359: vault-ssh-helper — Fixed in 0.2.0