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CVE-2017-5434

Mozilla: Use-after-free during focus handling (MFSA 2017-11, MFSA 2017-12)

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Severity

Important

Red Hat Product Security

9.8

CVSS 3.0

Review impact separately from score.

Published · April 19, 2017

Updated · November 21, 2025

Description

A use-after-free vulnerability occurs when redirecting focus handling which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

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 · 9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE not specified