CVE-2021-43536

Mozilla: URL leakage when navigating while executing asynchronous function

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · December 7, 2021

Updated · November 21, 2025

Description

The Mozilla Foundation Security Advisory describes this flaw as:

Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-1021 · Improper Restriction of Rendered UI Layers or Frames