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Fencer Intel
medium 6.5

CVE-2020-15664 json

By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigge…

published 6y ago modified 2mo ago also EUVD-2020-7651

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

By holding a reference to the eval() function from an about:blank window, a malicious webpage could have gained access to the InstallTrigger object which would allow them to prompt the user to install an extension. Combined with user confusion, this could result in an unintended or malicious extension being installed. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, Firefox ESR < 78.2, and Firefox for Android < 80.

Patch / fix

  • Mozilla Firefox 80
  • Mozilla Thunderbird 68.12, 78.2
  • Mozilla Firefox ESR 68.12, 78.2
  • Mozilla Firefox for Android 80
  • firefox-esr Debian 14, Debian 13, Debian 12 68.12.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:68.12.0-1

debian advisories DEBIAN-CVE-2020-15664

  • firefox Ubuntu 16.04 LTS 80.0+build2-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 80.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 80.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:78.8.1+build1-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:78.7.1+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2020-15664

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

  • thunderbird RHEL 6 68.12.0-1.el6_10
  • thunderbird RHEL 8 68.12.0-1.el8_2
  • thunderbird RHEL 7 68.12.0-1.el7_8
  • firefox RHEL 6 68.12.0-1.el6_10
  • firefox RHEL 7 68.12.0-1.el7_8
  • firefox RHEL 8 78.2.0-2.el8_2
  • thunderbird RHEL 8.0 E4S 68.12.0-1.el8_0
  • thunderbird RHEL 8.1 EUS 68.12.0-1.el8_1

red hat advisories RHSA-2020:3643RHSA-2020:3634RHSA-2020:3633RHSA-2020:3632RHSA-2020:3631RHSA-2020:3558

  • MozillaFirefox SLE Module for Desktop Applications 15 SP2 78.3.0-8.6.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1 78.2.0-3.105.1
  • MozillaThunderbird SLE Workstation Extension 15 SP2, SLE Workstation Extension 15 SP1 68.12.0-3.94.1
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 78.2.0-112.19.2
  • MozillaFirefox SLES 11 SP4-LTSS 78.2.0-78.90.2

suse advisories SUSE-SU-2020:2749-1SUSE-SU-2020:14489-1SUSE-SU-2020:2563-1SUSE-SU-2020:2552-1SUSE-SU-2020:2544-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird openSUSE Leap 15.2 68.12.0-lp152.2.10.1
  • MozillaFirefox openSUSE Leap 15.2 78.2.0-lp152.2.18.1
  • MozillaFirefox openSUSE Leap 15.1 78.2.0-lp151.2.65.1
  • MozillaThunderbird openSUSE Leap 15.1 68.12.0-lp151.2.50.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2020:1392-1openSUSE-SU-2020:1391-1openSUSE-SU-2020:1384-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 80.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 80.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 78.2.0-r0

alpine advisories ALPINE-CVE-2020-15664

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-15664 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2020-15664 updated cvss 6.5

Mozilla: Attacker-induced prompt for extension installation

  • Red Hat Enterprise Linux 5 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 78.2.0-2.el8_2, thunderbird 68.12.0-1.el8_2
    fixed: vendor fix RHSA-2020:3557
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 78.2.0-3.el8_0, thunderbird 68.12.0-1.el8_0
    fixed: vendor fix RHSA-2020:3555
  • Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox 78.2.0-3.el8_1, thunderbird 68.12.0-1.el8_1
    fixed: vendor fix RHSA-2020:3559
  • Red Hat Enterprise Linux Client (v. 7) firefox 68.12.0-1.el7_8, thunderbird 68.12.0-1.el7_8 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.12.0-1.el7_8
    fixed: vendor fix RHSA-2020:3556
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 68.12.0-1.el6_10, thunderbird 68.12.0-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.12.0-1.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.12.0-1.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 68.12.0-1.el6_10
    fixed: vendor fix RHSA-2020:3558
  • Red Hat Enterprise Linux Server (v. 7) firefox 68.12.0-1.el7_8
    fixed: vendor fix RHSA-2020:3556
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.12.0-1.el6_10, thunderbird 68.12.0-1.el6_10
    fixed: vendor fix RHSA-2020:3558
show 5 more
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.12.0-1.el7_8, thunderbird 68.12.0-1.el7_8
    fixed: vendor fix RHSA-2020:3556
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 68.12.0-1.el6_10, thunderbird 68.12.0-1.el6_10
    fixed: vendor fix RHSA-2020:3558
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 68.12.0-1.el7_8, thunderbird 68.12.0-1.el7_8
    fixed: vendor fix RHSA-2020:3556
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.12.0-1.el6_10
    fixed: vendor fix RHSA-2020:3558
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.12.0-1.el7_8
    fixed: vendor fix RHSA-2020:3556

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

1.39% chance of exploitation in the next 30 days, higher than 72% 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

  • Mozilla Firefox
  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox for Android

Classification

Weakness

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.