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No exploitation reportedFix available

CVE-2020-12417

No exploitation reported by the sources we read.

  • Published2020-07-09
  • WeaknessCWE-617 · CWE-681 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash. *Note: this issue only affects Firefox on ARM64 platforms.* This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

Timeline

dates in UTC
  1. 2020-07-0915:15CVE publishedNVD

Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
16.4= 16.04no fix published
18.4= 18.04no fix published
19.10= 19.10no fix published
20.4= 20.04no fix published
Opensuse leap
BranchAffectedFixed in
15.1= 15.1no fix published
15.2= 15.2no fix published
Mozilla firefox
BranchAffectedFixed in
78.0< 78.078.0

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:20.04:LTSall versions · fixed in 78.0.1+build1-0ubuntu0.20.04.1
  • firefoxUbuntu:18.04:LTSall versions · fixed in 78.0.1+build1-0ubuntu0.18.04.1
  • firefoxUbuntu:16.04:LTSall versions · fixed in 78.0.1+build1-0ubuntu0.16.04.1
  • firefoxRed Hat:rhel_eus:8.1::appstreamall versions · fixed in 0:68.10.0-1.el8_1and 5 other packages
  • firefoxRed Hat:rhel_e4s:8.0::appstreamall versions · fixed in 0:68.10.0-1.el8_0and 5 other packages
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:68.10.0-1.el8_2and 5 other packages
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:68.10.0-1.el7_8and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:68.10.0-1.el7_8and 3 other packages

98 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-12417 Red Hat Product Security89 products fixed

    Mozilla: Memory corruption due to missing sign-extension for ValueTags on ARM64

  • RHSA-2020:3038 Red Hat Product Security10 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:3046 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:2906 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:2907 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2020:2827 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: firefox security update

3 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2020:3038 · 10 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  2. Vendor fix Red Hat Product Security RHSA-2020:2827 · 21 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.09.3read 2026-10-23
  • NVDweakness (CWE)CWE-617, CWE-681, CWE-787read 2026-10-23
  • FIRST EPSSEPSS score2.7 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2020-07-09
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-h4ph-w5wh-mj4j

Frequently asked questions

What is CVE-2020-12417?

Due to confusion about ValueTags on JavaScript Objects, an object may pass through the type barrier, resulting in memory corruption and a potentially exploitable crash. *Note: this issue only affects Firefox on ARM64 platforms.* This vulnerability affects Firefox ESR < 68.10, Firefox < 78, and Thunderbird < 68.10.0.

Is CVE-2020-12417 actively exploited?

Active exploitation of CVE-2020-12417 has not been confirmed. Its EPSS score was 2.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-12417?

CVE-2020-12417 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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