Remote code execution in Eclipse OpenJ9

Published: 2021-01-21
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-27221
Exploitation vector Network
Public exploit N/A
Vulnerable software
Server applications / Virtualization software

Vendor Eclipse

Security Advisory

This security advisory describes one high risk vulnerability.

1) Stack-based buffer overflow

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-27221

CWE-ID: CWE-121 - Stack-based Buffer Overflow

Exploit availability: No


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

The vulnerability exists due to a boundary error when the virtual machine or JNI natives are converting from UTF-8 characters to platform encoding. A remote unauthenticated attacker can trigger a stack-based buffer overflow and execute arbitrary code on the target system.

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


Install updates from vendor's website.

Vulnerable software versions

OpenJ9: 0.20.0, 0.20.0-m1, 0.20.0-m2, 0.21.0, 0.21.0-m1, 0.21.0-m2, 0.22.0, 0.22.0-m1, 0.22.0-m2, 0.23.0, 0.23.0-m1, 0.23.0-m2

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.