Code Injection in Zulip Server - CVE-2021-43799
Published: January 25, 2022 / Updated: February 1, 2023
Vulnerability identifier: #VU59991
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-2021-43799
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation. A remote attacker can send a specially crafted request and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Zulip Server
How to mitigate CVE-2021-43799
Install updates from vendor's website.
Zulip Server - update to 4.9