Read the docs
TI-2020-16400 Aliases CVE-2020-26977GHSA-qx8w-qf9q-g5vp

By attempting to connect a website using an unresponsive port, an attacker could have…

Priority LOW 30Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

By attempting to connect a website using an unresponsive port, an attacker could have controlled the content of a tab while the URL bar displayed the original domain. *Note: This issue only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 84.

Why it matters now

EPSS 0.00869 59th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 84

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 8484Patch availableCNA
  • Firefox VendorMozilla Affected before 84 Fixed in 84 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:*before 84.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:* Versions before 84.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 84

Fixed in the same release

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

  • Release ·

    Mozilla Firefox 84

    13 records Highest priority Priority MEDIUM 7 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2020-16395 Use after free in Mozilla FirefoxPriority MEDIUM 45
    • TI-2020-16394 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
    • TI-2020-17831 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 41
    Show all 13 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26977
  2. 2026-10-03 Alias added: GHSA-qx8w-qf9q-g5vp

References

Advisory 1

Other 1

  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2022-09831 Use after free in Mozilla Firefox KEVCVSS 3.1HIGH 8.8
  • TI-2023-13905 Race condition in Mozilla Firefox for Android CVSS 3.1HIGH 7.5
  • TI-2023-13916 A wrong lowering instruction in the ARM64 Ion compiler resulted in a wrong optimization… CVSS 3.1MEDIUM 6.5
  • TI-2023-13903 Following a Garbage Collector compaction, weak maps may have been accessed before they… CVSS 3.1MEDIUM 6.5
  • TI-2022-13642 Information disclosure in Mozilla Firefox for iOS CVSS 3.1MEDIUM 6.5
See all 86 →

Sources

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