CVE-2020-15663

highpriority · track · 36EPSS 0.027 · 86 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.72% (86th) EPSS

CVSS 9.3 · high

Is it mine?

49 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-27

If Firefox is installed to a user-writable directory, the Mozilla Maintenance Service would execute updater.exe from the install location with system privileges. Although the Mozilla Maintenance Service does ensure that updater.exe is signed by Mozilla, the version could have been rolled back to a previous version which would have allowed exploitation of an older bug and arbitrary code execution with System Privileges. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 80, Thunderbird < 78.2, Thunderbird < 68.12, Firefox ESR < 68.12, and Firefox ESR < 78.2.

cvss

Technical severity, 0–10. One row per scoring source.

9.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.09.3highAV:N/AC:M/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 8.6 · impact 10

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-427USprimaryCWE-282USCWE-427US

affected products (49)

Products and version ranges known to be affected.

Mozilla Firefoxunspecified → 80enisa_euvdEU
Mozilla Firefox ESRunspecified → 68.12enisa_euvdEU
Mozilla Firefox ESRunspecified → 78.2enisa_euvdEU
Mozilla Thunderbirdunspecified → 68.12enisa_euvdEU
Mozilla Thunderbirdunspecified → 78.2enisa_euvdEU
Mozilla Corp. Firefox≤ 80fstec_bduRU
Mozilla Corp. Firefox ESR≤ 68.12fstec_bduRU
Mozilla Corp. Firefox ESR≤ 78.2fstec_bduRU
Mozilla Corp. Thunderbird≤ 68.12fstec_bduRU
Mozilla Corp. Thunderbird≤ 78.2fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.3fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.2fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.4fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 15 SP1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 12 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 12 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 12 SP3fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 15 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Server for SAP Applications≤ 15 SP2fstec_bduRU

showing 20 of 49

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2020-10-01modified 2026-06-17

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+1382 more

references (26)

External citations — patches, advisories, analysis.

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