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CVE Vulnerabilities

CVE-2017-5447

Use After Free

Published: Jun 11, 2018 | Modified: Nov 25, 2025
CVSS 3.x
9.1
CRITICAL
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CVSS 2.x
6.4 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P
RedHat/V2
RedHat/V3
9.1 IMPORTANT
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-5447
CWEhttps://cwe.mitre.org/data/definitions/416.html

An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

NameVendorStart VersionEnd Version
Debian_linuxDebian9.0 (including)9.0 (including)
Red Hat Enterprise Linux 6RedHatfirefox-0:52.1.0-2.el6_9*
Red Hat Enterprise Linux 6RedHatthunderbird-0:52.1.0-1.el6_9*
Red Hat Enterprise Linux 7RedHatfirefox-0:52.1.0-2.el7_3*
Red Hat Enterprise Linux 7RedHatthunderbird-0:52.1.0-1.el7_3*
FirefoxUbuntudevel*
FirefoxUbuntuprecise*
FirefoxUbuntutrusty*
FirefoxUbuntuupstream*
FirefoxUbuntuxenial*
FirefoxUbuntuyakkety*
FirefoxUbuntuzesty*
ThunderbirdUbuntudevel*
ThunderbirdUbuntuprecise*
ThunderbirdUbuntutrusty*
ThunderbirdUbuntuupstream*
ThunderbirdUbuntuxenial*
ThunderbirdUbuntuyakkety*
ThunderbirdUbuntuzesty*

Potential Mitigations

References

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