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Fencer Vulns
medium 4.7

CVE-2020-6827 json

When following a link that opened an intent://-schemed URL, causing a custom tab to be opened, Firefox for Android could be tricked into di…

published 2020-04-24 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27971

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

When following a link that opened an intent://-schemed URL, causing a custom tab to be opened, Firefox for Android could be tricked into displaying the incorrect URI. <br> *Note: This issue only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.7.

Patch / fix

  • Mozilla Firefox ESR 68.7
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 68.7.0-109.116.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1 68.7.0-3.84.2
  • MozillaFirefox SLES 11 SP4-LTSS 68.7.0-78.70.1

suse advisories SUSE-SU-2020:0978-1SUSE-SU-2020:14339-1SUSE-SU-2020:0971-1

  • MozillaFirefox openSUSE Leap 15.1 68.7.0-lp151.2.42.1

opensuse advisories openSUSE-SU-2020:0493-1

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-2020-6827 updated cvss 4.7

Mozilla: Custom Tabs in Firefox for Android could have the URI spoofed

  • Red Hat Enterprise Linux 5 firefox Red Hat Enterprise Linux 6 firefox Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox
    not affected: vulnerable code not present

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

0.76% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • Mozilla Firefox ESR

Classification

Weakness
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames

References

Sources

Fencer Vulns 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.