Vulnerability Report

CVE-2021-39144

RCE CISA KEV Active

Title: Arbitrary Command Execution

RCE

Proof Of Concept

PoC Available for CVE-2021-39144

CWE Category CWE-306
Published Date Aug 23, 2021
Modified Date Oct 24, 2025
Exploit Status Available
Score 8.5 CVSS v3.1
Exploit Probability (EPSS)
98.12%

Vulnerability Summary

CVE-2021-39144: XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

Impacted Vendors

O
oracle 11
X
xstream 1
N
netapp 1

Reference Links

http://packetstormsecurity.com/files/169859/VMware-NSX-Manager-XStream-Unauthenticated-Remote-Code-Execution.html https://github.com/x-stream/xstream/security/advisories/GHSA-j9h8-phrw-h4fh https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/ https://security.netapp.com/advisory/ntap-20210923-0003/ https://www.debian.org/security/2021/dsa-5004 https://www.oracle.com/security-alerts/cpuapr2022.html https://www.oracle.com/security-alerts/cpujan2022.html https://www.oracle.com/security-alerts/cpujul2022.html https://x-stream.github.io/CVE-2021-39144.html http://packetstormsecurity.com/files/169859/VMware-NSX-Manager-XStream-Unauthenticated-Remote-Code-Execution.html https://github.com/x-stream/xstream/security/advisories/GHSA-j9h8-phrw-h4fh https://lists.debian.org/debian-lts-announce/2021/09/msg00017.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/ https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/ https://security.netapp.com/advisory/ntap-20210923-0003/ https://www.debian.org/security/2021/dsa-5004 https://www.oracle.com/security-alerts/cpuapr2022.html https://www.oracle.com/security-alerts/cpujan2022.html https://www.oracle.com/security-alerts/cpujul2022.html https://x-stream.github.io/CVE-2021-39144.html https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-39144
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.5
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.5
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
6.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:M/Au:S/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-39144 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/zwjjustdoit/Xstream-1.4.17
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.