CVE-2020-12426

highpriority · track · 36EPSS 0.016 · 76 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.61% (76th) EPSS

CVSS 9.3 · high

Is it mine?

32 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Mozilla developers and community members reported memory safety bugs present in Firefox 77. 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 < 78.

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⚠ sources disagree · high–critical · 8.1–9.3

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

v2.09.3criticalAV:N/AC:M/Au:N/C:C/I:C/A:Csecondary · 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-787USprimaryCWE-119US

affected products (32)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Avaya Aura Application Enablement Services <78all versionscert_bundDE
Avaya Aura Experience Portal <78all versionscert_bundDE
Avaya one-X <78all versionscert_bundDE
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Mozilla Firefox <78.0all versionscert_bundDE
Mozilla Firefox for Android <68.10.0all versionscert_bundDE
Mozilla Thunderbird <68.10.0all versionscert_bundDE
Mozilla Thunderbird <78all versionscert_bundDE
Open Source CentOSall versionscert_bundDEcpe:/o:centos:centos:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Avaya Aura Application Enablement Services< 78cert_bundDE
Avaya Aura Experience Portal< 78cert_bundDE
Avaya one-X< 78cert_bundDE
Mozilla Firefox≤ for Android <68.10.0cert_bundDE
Mozilla Firefox< 78.0cert_bundDE
Mozilla Thunderbird< 68.10.0cert_bundDE

showing 20 of 32

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0457Mozilla Firefox/Thunderbird: Mehrere SchwachstellenDeutsch2020-06-30csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Thunderbird ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2020-07-09modified 2026-06-17

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Related entries.

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+16123 more

references (22)

External citations — patches, advisories, analysis.

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