Which versions are affected by CVE-2024-45337?

Affected: Go < 1.22.10, < 1.23.4. Fixed in: Go 1.22.10+, 1.23.4+.

criticalCVSS 9.1/10·Published: 2024-12-11·Go standard library (crypto/ssh)

How to fix CVE-2024-45337 – Step-by-Step Guide

CVE-2024-45337 (Go crypto/ssh – Misuse of ServerConfig.PublicKeyCallback) is a CRITICAL severity vulnerability with a CVSS score of 9.1/10. Applications using crypto/ssh's ServerConfig.PublicKeyCallback may incorrectly authorize connections when the callback approves a key but authentication fails, due to a logic flaw in the authentication flow. Follow the step-by-step guide below to remediate this vulnerability in your infrastructure.

CVE ID

CVE-2024-45337

Severity

CRITICAL

CVSS Score

9.1/10

Affected

Go standard library (crypto/ssh)

What is Go crypto/ssh – Misuse of ServerConfig.PublicKeyCallback?

Go crypto/ssh – Misuse of ServerConfig.PublicKeyCallback (CVE-2024-45337) affects Go standard library (crypto/ssh). Applications using crypto/ssh's ServerConfig.PublicKeyCallback may incorrectly authorize connections when the callback approves a key but authentication fails, due to a logic flaw in the authentication flow. It was published on 2024-12-11 and affects Go < 1.22.10, < 1.23.4. The fixed version is Go 1.22.10+, 1.23.4+.

Affected Versions

Go < 1.22.10, < 1.23.4

Fixed In

Go 1.22.10+, 1.23.4+

Official References

Impact and Risks for your Infrastructure

Unauthorized SSH authentication bypass in Go applications. Attackers can authenticate to SSH servers using any public key if the PublicKeyCallback is improperly implemented.

gosshauth-bypasscritical2024

Step-by-Step Mitigation Guide

To remediate CVE-2024-45337, follow the prioritized mitigation steps: Upgrade Go to 1.22.10+ or 1.23.4+. → Review your PublicKeyCallback implementation to ensure it rejects unauthorized keys. → Add explicit key allowlist validation inside PublicKeyCallback. → Rotate SSH host keys and audit SSH access logs for anomalies. → Run static analysis (govulncheck) to detect usage of vulnerable patterns. → Pin allowed public keys in your callback rather than relying on post-callback checks.. Verify the fix using the verification commands below and confirm the patched version is deployed across all affected systems.

1Upgrade Go to 1.22.10+ or 1.23.4+.
2Review your PublicKeyCallback implementation to ensure it rejects unauthorized keys.
3Add explicit key allowlist validation inside PublicKeyCallback.
4Rotate SSH host keys and audit SSH access logs for anomalies.
5Run static analysis (govulncheck) to detect usage of vulnerable patterns.
6Pin allowed public keys in your callback rather than relying on post-callback checks.

Frequently Asked Questions

What is the CVSS score for CVE-2024-45337?▼

CVE-2024-45337 has a CVSS score of 9.1/10 (critical severity). This reflects the most severe potential impact, requiring immediate remediation.

Which versions of Go standard library (crypto/ssh) are affected?▼

Affected: Go < 1.22.10, < 1.23.4. The vulnerability was fixed in: Go 1.22.10+, 1.23.4+.

How long does it take to fix CVE-2024-45337?▼

For most teams: 15–60 minutes to apply the patch, plus 15 minutes of post-patch verification. Complex multi-service environments may require 2–4 hours including staging validation.

Is CVE-2024-45337 being actively exploited?▼

Check the NVD entry and CISA KEV catalog for exploitation status. As a critical-severity vulnerability, treat it as a priority remediation regardless of known exploitation status.

Run Security Check →Browse Runbooks →← All CVE Solutions

This CVE fix guide is based on publicly available security advisories (NVD, vendor bulletins). Always test changes in a staging environment before applying to production. Verify against the official vendor advisory for the most up-to-date guidance.