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Fencer Vulns
low 2.8

CVE-2020-6824 json

Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the Private Browsing Window but leaves F…

published 2020-04-24 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27968

cvss
2.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

Initially, a user opens a Private Browsing Window and generates a password for a site, then closes the Private Browsing Window but leaves Firefox open. Subsequently, if the user had opened a new Private Browsing Window, revisited the same site, and generated a new password - the generated passwords would have been identical, rather than independent. This vulnerability affects Firefox < 75.

Patch / fix

  • Mozilla Firefox 75
  • firefox Ubuntu 16.04 LTS 75.0+build3-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 75.0+build3-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 75.0+build3-0ubuntu1

ubuntu advisories UBUNTU-CVE-2020-6824

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

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2

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

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 75.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 75.0-r0

alpine advisories ALPINE-CVE-2020-6824

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

  • firefox Arch Linux 75.0-1

arch linux advisories AVG-1127

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-2020-6824 updated cvss 2.8

Mozilla: Generated passwords may be identical on the same site between separate private browsing sessions

  • Red Hat Enterprise Linux 5 firefox
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 6 firefox
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox
    affected: no fix planned “Will not fix”

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

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 2.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
NVD 2.0 1.9 AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness

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.