CVE-2020-26977

medium

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

5.5

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-26977

OS impact

OS	Version	Status	Fixed in
arch		fixed	`84.0-1`
debian	sid	fixed	`0`

References

https://security-tracker.debian.org/tracker/CVE-2020-26977

Verify integrity in audit chain (admin only). AS-IS.