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Fencer Intel
high 7.8

CVE-2020-15657 json

Firefox could be made to load attacker-supplied DLL files from the installation directory.

published 6y ago modified 4mo ago also EUVD-2020-7644

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 29%
public exploits
0
none known

Summary

Firefox could be made to load attacker-supplied DLL files from the installation directory. This required an attacker that is already capable of placing files in the installation directory. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Patch / fix

  • Mozilla Firefox ESR 78.1
  • Mozilla Firefox 79
  • Mozilla Thunderbird 78.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP2 78.1.0-8.3.1
  • pipewire SLE Module for Desktop Applications 15 SP2 0.3.6-3.3.2
  • MozillaFirefox-branding-SLE SLE Module for Desktop Applications 15 SP2 78-9.2.4
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1 78.1.0-3.100.2
  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +15 more 78.1.0-112.8.1
  • MozillaFirefox SLES 11 SP4-LTSS 78.1.0-78.87.1

suse advisories SUSE-SU-2020:14456-1SUSE-SU-2020:2147-1SUSE-SU-2020:2118-1SUSE-SU-2020:2100-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaFirefox openSUSE Leap 15.2 78.1.0-lp152.2.15.1
  • pipewire openSUSE Leap 15.2 0.3.6-lp152.2.3.1
  • MozillaFirefox openSUSE Leap 15.2 78.1.0-lp152.2.12.1
  • MozillaFirefox openSUSE Leap 15.1 78.1.0-lp151.2.61.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2020:1189-1openSUSE-SU-2020:1155-1openSUSE-SU-2020:1147-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 79.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 79.0-r0
  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 78.1.0-r0

alpine advisories ALPINE-CVE-2020-15657

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-2020-15657 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.

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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-2020-15657 updated cvss 7.3

Mozilla: DLL hijacking due to incorrect loading path

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

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Mozilla Firefox ESR
  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-427 Uncontrolled Search Path Element

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.