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CVE Vulnerabilities

CVE-2017-5396

Use After Free

Published: Jun 11, 2018 | Modified: Nov 25, 2025
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
5.1 MODERATE
AV:N/AC:H/Au:N/C:P/I:P/A:P
RedHat/V3
9.8 MODERATE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2017-5396
CWEhttps://cwe.mitre.org/data/definitions/416.html

A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are freed from memory. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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_linuxDebian8.0 (including)8.0 (including)
Red Hat Enterprise Linux 5RedHatfirefox-0:45.7.0-2.el5_11*
Red Hat Enterprise Linux 5RedHatthunderbird-0:45.7.0-1.el5_11*
Red Hat Enterprise Linux 6RedHatfirefox-0:45.7.0-2.el6_8*
Red Hat Enterprise Linux 6RedHatthunderbird-0:45.7.0-1.el6_8*
Red Hat Enterprise Linux 7RedHatfirefox-0:45.7.0-2.el7_3*
Red Hat Enterprise Linux 7RedHatthunderbird-0:45.7.0-1.el7_3*
FirefoxUbuntuprecise*
FirefoxUbuntutrusty*
FirefoxUbuntuupstream*
FirefoxUbuntuxenial*
FirefoxUbuntuyakkety*
FirefoxUbuntuzesty*
ThunderbirdUbuntudevel*
ThunderbirdUbuntuprecise*
ThunderbirdUbuntutrusty*
ThunderbirdUbuntuxenial*
ThunderbirdUbuntuyakkety*
ThunderbirdUbuntuzesty*

Potential Mitigations

References

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