Buffer overflow in SonicOS - CVE-2021-20027
Published: June 15, 2021
Vulnerability identifier: #VU54104
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-20027
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing HTTP headers. A remote attacker can send a specially crafted HTTP request to the system, trigger a buffer overflow and perform a denial of service (DoS) attack.
Affected software
SonicOS
How to mitigate CVE-2021-20027
Install updates from vendor's website.
Note, this vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.
SonicOS - addressed in versions 6.5.4.v_21s-1288, 6.5.4.8-89n, 7.0.1-R579