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Fencer Intel
medium 6.5

CVE-2017-5120 json

Inappropriate use of www mismatch redirects in browser navigation in Google Chrome prior to 61.0.3163.79 for Mac, Windows, and Linux, and 6…

published 2017-10-27 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-14229

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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).

Patch / fix

  • google chrome 61.0.3163.79, 61.0.3163.81
  • chromium-browser Ubuntu 14.04 LTS 61.0.3163.100-0ubuntu0.14.04.1202
  • chromium-browser Ubuntu 16.04 LTS 61.0.3163.100-0ubuntu0.16.04.1306
  • chromium-browser Ubuntu 18.04 LTS 61.0.3163.100-0ubuntu1.1378

ubuntu advisories UBUNTU-CVE-2017-5120

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium-browser RHEL 6 EXTRAS 61.0.3163.79-2.el6_9

red hat advisories RHSA-2017:2676

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium Package Hub 12 SP2 61.0.3163.79-29.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2017:2482-1openSUSE-SU-2017:2491-1

  • chromium Arch Linux 61.0.3163.79-1

arch linux advisories AVG-391

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-5120 updated cvss 4.3

chromium-browser: potential https downgrade during redirect navigation

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 61.0.3163.79-2.el6_9 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 61.0.3163.79-2.el6_9 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 61.0.3163.79-2.el6_9
    fixed: vendor fix RHSA-2017:2676

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • n/a Google Chrome prior to 61.0.3163.79 for Mac, Windows and Linux, and 61.0.3163.81 for Android

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.