Improper Restriction of Rendered UI Layers or Frames Affecting firefox-esr package, versions <91.3.0esr-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
2.14% (89th percentile)

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  • Snyk IDSNYK-DEBIAN13-FIREFOXESR-5679911
  • published3 Nov 2021
  • disclosed8 Dec 2021

Introduced: 3 Nov 2021

CVE-2021-38509  (opens in a new tab)
CWE-1021  (opens in a new tab)

How to fix?

Upgrade Debian:13 firefox-esr to version 91.3.0esr-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

CVSS Scores

version 3.1