Buffer overflow in FwBlockServiceSmm - CVE-2021-33627
Published: February 3, 2022
Vulnerability identifier: #VU60276
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-33627
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in SMM (System Management Mode) branch that registers a SWSMI handler. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
FwBlockServiceSmm
PA-3200
PA-5200
PA-7200
PA-3200
PA-5200
PA-7200
How to mitigate CVE-2021-33627
Install updates from vendor's website.
FwBlockServiceSmm - addressed in versions 5.0: 05.08.29, 5.1: 05.16.29, 5.2: 05.26.29, 5.3: 05.35.29