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TI-2020-12329 Aliases CVE-2020-15654GHSA-8j7j-8w2r-72pq

Infinite loop in Mozilla Firefox ESR

Priority LOW 32CWE-835Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · High · None
Fix status
Partial Red Hat: 9 fixed, 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-835.

Summary

When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Why it matters now

EPSS 0.01423 73rd percentileScored 2026-11-07
Fix Partial Firefox ESR (Mozilla): 78.1Firefox (Mozilla): 79+1 more productRed Hat: 4 advisoriesRed Hat: 9 fixed, 4 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox ESRbefore 78.178.1Patch availableCNA
MozillaFirefoxbefore 7979Patch availableCNA
MozillaThunderbirdbefore 78.178.1Patch availableCNA
  • Firefox ESR VendorMozilla Affected before 78.1 Fixed in 78.1 Patch available CNA
  • Firefox VendorMozilla Affected before 79 Fixed in 79 Patch available CNA
  • Thunderbird VendorMozilla Affected before 78.1 Fixed in 78.1 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 79.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 78.1VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 78.1VulnerableMozilla
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 79.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 78.1 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 78.1 Vulnerable ·Mozilla
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical

Remediation

  • Fix · CNA Firefox ESR (Mozilla) Fixed in 78.1
  • Fix · CNA Firefox (Mozilla) Fixed in 79
  • Fix · CNA Thunderbird (Mozilla) Fixed in 78.1

Red Hat 4 advisories

  • RHSA-2020:4080 Released 2020-09-30 · Red Hat rating Important
    firefox security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) firefox-78.3.0-1.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-78.3.0-1.el7_9
    • Red Hat Enterprise Linux Server (v. 7) firefox-78.3.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-78.3.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-78.3.0-1.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-78.3.0-1.el7_9
  • RHSA-2020:3559 Released 2020-08-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox-78.2.0-3.el8_1
  • RHSA-2020:3557 Released 2020-08-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-78.2.0-2.el8_2
Show 1 more Red Hat advisories
  • RHSA-2020:3555 Released 2020-08-26 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox-78.2.0-3.el8_0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 79

    8 records Highest priority Priority MEDIUM 2 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2020-12334 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 43
    • TI-2020-12331 Type confusion in Mozilla Firefox ESRPriority MEDIUM 41
    • TI-2020-12332 Uncontrolled search path in Mozilla Firefox ESRPriority LOW 34
    Show all 8 records →
  • Release ·

    Mozilla Firefox ESR, Thunderbird 78.1

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2020-12331 Type confusion in Mozilla Firefox ESRPriority MEDIUM 41
    • TI-2020-12332 Uncontrolled search path in Mozilla Firefox ESRPriority LOW 34
    • TI-2020-12333 Improper check for unusual conditions in Mozilla Firefox ESRPriority LOW 32
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux 8AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:3557
Red Hat Enterprise Linux AppStream E4S (v. 8.0)Fixed RHSA-2020:3555
Red Hat Enterprise Linux AppStream EUS (v. 8.1)Fixed RHSA-2020:3559
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:4080
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:4080
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4080
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4080
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4080
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4080
Not affected: 1 product
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-15654
  2. 2026-10-03 Alias added: GHSA-8j7j-8w2r-72pq

References

Advisory 6

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences