PT-2021-5402 · Mozilla+7 · Firefox Esr+9

Julien Cristau

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Published

2021-10-05

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Updated

2023-09-22

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CVE-2021-43535

CVSS v2.0

9.3

High

VectorAV:N/AC:M/Au:N/C:C/I:C/A:C
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 93 Thunderbird versions prior to 91.3 Firefox ESR versions prior to 91.3
Description A use-after-free issue could have occurred when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. The issue is related to the use of memory after it has been freed, which may allow a remote attacker to execute arbitrary code.
Recommendations For Firefox versions prior to 93, update to version 93 or later to resolve the issue. For Thunderbird versions prior to 91.3, update to version 91.3 or later to resolve the issue. For Firefox ESR versions prior to 91.3, update to version 91.3 or later to resolve the issue.

Exploit

Fix

Use After Free

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2021-3005
ALT-PU-2021-3069
ALT-PU-2021-3226
ALT-PU-2021-3259
ALT-PU-2021-3368
ALT-PU-2021-3370
ALT-PU-2022-1782
ALT-PU-2022-1783
ALT-PU-2022-2458
ALT-PU-2022-2929
ALT-PU-2023-1138
ALT-PU-2023-4336
BDU:2021-06241
CESA-2021_4116
CESA-2021_4123
CESA-2021_4130
CESA-2021_4134
CVE-2021-43535
DLA-2863-1
DLA-2874-1
DSA-5026-1
DSA-5034-1
MGASA-2021-0505
MGASA-2021-0506
OESA-2023-1673
OESA-2023-1674
RHSA-2021:4116
RHSA-2021:4123
RHSA-2021:4130
RHSA-2021:4132
RHSA-2021:4133
RHSA-2021:4134
RHSA-2021:4605
RHSA-2021:4607
RHSA-2021_4116
RHSA-2021_4123
RHSA-2021_4130
RHSA-2021_4134
RLSA-2021:4123
RLSA-2021:4130
USN-5248-1

Affected Products

Alt Linux
Astra Linux
Centos
Firefox
Firefox Esr
Linuxmint
Red Hat
Rocky Linux
Thunderbird
Ubuntu