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CVE-2017-7753

Mozilla: Out-of-bounds read with cached style data and pseudo-elements (MFSA 2017-19)

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Severity

Important

Red Hat Product Security

9.1

CVSS 3.0

Review impact separately from score.

Published · August 8, 2017

Updated · November 26, 2025

Description

An out-of-bounds read occurs when applying style rules to pseudo-elements, such as ::first-line, using cached style data. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

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 · 9.1
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE-125 · Out-of-bounds Read