Vulnerabilities
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CVE Vulnerabilities

CVE-2017-7793

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
RedHat/V3
9.8 IMPORTANT
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-2017-7793
CWEhttps://cwe.mitre.org/data/definitions/416.html

A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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_linuxDebian7.0 (including)7.0 (including)
Debian_linuxDebian8.0 (including)8.0 (including)
Debian_linuxDebian9.0 (including)9.0 (including)
Red Hat Enterprise Linux 6RedHatfirefox-0:52.4.0-1.el6_9*
Red Hat Enterprise Linux 6RedHatthunderbird-0:52.4.0-2.el6_9*
Red Hat Enterprise Linux 7RedHatfirefox-0:52.4.0-1.el7_4*
Red Hat Enterprise Linux 7RedHatthunderbird-0:52.4.0-2.el7_4*
FirefoxUbuntuartful*
FirefoxUbuntubionic*
FirefoxUbuntudevel*
FirefoxUbuntutrusty*
FirefoxUbuntuupstream*
FirefoxUbuntuxenial*
FirefoxUbuntuzesty*
ThunderbirdUbuntuartful*
ThunderbirdUbuntubionic*
ThunderbirdUbuntudevel*
ThunderbirdUbuntutrusty*
ThunderbirdUbuntuupstream*
ThunderbirdUbuntuxenial*
ThunderbirdUbuntuzesty*

Potential Mitigations

References

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