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Fencer Vulns
high 8.8

CVE-2020-15670 json

Mozilla developers reported memory safety bugs present in Firefox for Android 79.

published 2020-10-01 6 y ago modified 2026-08-19 2 mo ago also EUVD-2020-7657

cvss
8.8
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 65%
public exploits
0
none known

Summary

Mozilla developers reported memory safety bugs present in Firefox for Android 79. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 80, Firefox ESR < 78.2, Thunderbird < 78.2, and Firefox for Android < 80.

Patch / fix

  • Mozilla Firefox 80
  • Mozilla Firefox ESR 78.2
  • Mozilla Thunderbird 78.2
  • Mozilla Firefox for Android 80
  • 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-2020-15670

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

  • 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
  • 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-2020:2544-1

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

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-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-2020-15670

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

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-2020-15670 updated cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox 80 and Firefox ESR 78.2

  • Red Hat Enterprise Linux 5 firefox, thunderbird Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird
    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

1.07% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

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

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
  • CWE-416 Use After Free
  • CWE-617 Reachable Assertion

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.