What’s Vulnerable › Vulnerabilities

CVE-2017-3204

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-04-04 · updated 2026-06-17
• Weakness: CWE-310

Description

The Go SSH library (x/crypto/ssh) by default does not verify host keys, facilitating man-in-the-middle attacks. Default behavior changed in commit e4e2799 to require explicitly registering a hostkey verification mechanism.

Affected products

• golang.org/x/crypto/ssh: through 2017-03-17

References

• http://www.securityfocus.com/bid/97481
• https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/
• https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991
• https://github.com/golang/go/issues/19767
• https://godoc.org/golang.org/x/crypto/ssh
• http://www.securityfocus.com/bid/97481
• https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/
• https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991
• https://github.com/golang/go/issues/19767
• https://godoc.org/golang.org/x/crypto/ssh

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