Deserialization of Untrusted Data in Apache Log4j - CVE-2019-17571

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Main Vulnerability Database Vulnerabilities #VU27960

Deserialization of Untrusted Data in Apache Log4j - CVE-2019-17571

Published: May 18, 2020 / Updated: March 10, 2026


Vulnerability identifier: #VU27960
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2019-17571
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Log4j

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data within the SocketServer class in Log4j. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system,  if these is a deserialization gadget listening to untrusted network traffic for log data.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


How to mitigate CVE-2019-17571

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Sources