CVE-2017-3204

Name: CVE-2017-3204
Creator: NVD / NIST
Published: 2017-04-04T14:59:00.18+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 3.16%

Last modified Jun 17, 2026

CVE-2017-3204 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 3.16% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.16%

86.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-310

Affected Software

Vendor	Product	Versions
Golang	Crypto	<= 2017-03-17

References

http://www.securityfocus.com/bid/97481Third Party Advisory, VDB Entry
https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/Third Party Advisory
https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991Patch, Third Party Advisory
https://github.com/golang/go/issues/19767Third Party Advisory
https://godoc.org/golang.org/x/crypto/sshVendor Advisory
http://www.securityfocus.com/bid/97481Third Party Advisory, VDB Entry
https://bridge.grumpy-troll.org/2017/04/golang-ssh-security/Third Party Advisory
https://github.com/golang/crypto/commit/e4e2799dd7aab89f583e1d898300d96367750991Patch, Third Party Advisory
https://github.com/golang/go/issues/19767Third Party Advisory
https://godoc.org/golang.org/x/crypto/sshVendor Advisory

Timeline

Published: Apr 4, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-3204?

How severe is CVE-2017-3204?

CVE-2017-3204 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 3.16% probability of exploitation in the next 30 days.

How do I fix CVE-2017-3204?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST