What’s Vulnerable › Vulnerabilities

CVE-2017-5120

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-10-27 · updated 2026-06-17

Description

Inappropriate use of www mismatch redirects in browser navigation in Google Chrome prior to 61.0.3163.79 for Mac, Windows, and Linux, and 61.0.3163.81 for Android, allowed a remote attacker to potentially downgrade HTTPS requests to HTTP via a crafted HTML page. In other words, Chrome could transmit cleartext even though the user had entered an https URL, because of a misdesigned workaround for cases where the domain name in a URL almost matches the domain name in an X.509 server certificate (but differs in the initial "www." substring).

Affected products

• Debian Linux: 9.0, 10.0
• Google Chrome: before 61.0.3163.79; before 61.0.3163.81 — fixed in 61.0.3163.79, 61.0.3163.81
• RedHat Enterprise Linux Desktop: 6.0
• RedHat Enterprise Linux Server: 6.0
• RedHat Enterprise Linux Workstation: 6.0

How to fix

Upgrade to a fixed version: Google Chrome 61.0.3163.79, 61.0.3163.81. Check the vendor advisory for mitigations.

References

• http://www.debian.org/security/2017/dsa-3985
• http://www.securityfocus.com/bid/100610
• http://www.securitytracker.com/id/1039291
• https://access.redhat.com/errata/RHSA-2017:2676
• https://chromereleases.googleblog.com/2017/09/stable-channel-update-for-desktop.html
• https://crbug.com/718676
• https://security.gentoo.org/glsa/201709-15
• http://www.debian.org/security/2017/dsa-3985
• http://www.securityfocus.com/bid/100610
• http://www.securitytracker.com/id/1039291
• https://access.redhat.com/errata/RHSA-2017:2676
• https://chromereleases.googleblog.com/2017/09/stable-channel-update-for-desktop.html

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