PT-2021-5150 · Xstream+7 · Xstream+7

Published 2021-03-12 · Updated 2026-03-13 · CVE-2021-21345

Positive Technologies (AI Summary)

CVSS v3.1

9.9

Critical

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions XStream versions prior to 1.4.16

Description The issue concerns a Java library used for serializing objects to XML and back. It may allow a remote attacker with sufficient rights to execute commands on the host by manipulating the processed input stream. Users who set up XStream's security framework with a whitelist limited to the minimal required types are not affected. The vulnerability is related to incorrect code generation management.

Recommendations For versions prior to 1.4.16, update to at least version 1.4.16 to resolve the issue. As a temporary workaround, consider setting up XStream's security framework with a whitelist limited to the minimal required types to minimize the risk of exploitation.

Exploit

Fix

RCE

OS Command Injection

Code Injection

Deserialization of Untrusted Data

Weakness Enumeration

CWE-78

CWE-94

CWE-502

Related Identifiers

ALT-PU-2022-7660

BDU:2021-05946

BIT-ACTIVEMQ-2021-21345

CESA-2021_1354

CVE-2021-21345

DLA-2616-1

DSA-5004-1

ELSA-2021-1354

GHSA-HWPC-8XQV-JVJ4

MGASA-2021-0370

OESA-2021-1185

OPENSUSE-SU-2021:0832-1

OPENSUSE-SU-2021:1840-1

OPENSUSE-SU-2021_0832-1

OPENSUSE-SU-2021_1840-1

OPENSUSE-SU-2024:10592-1

RHSA-2021:1354

RHSA-2021_1354

SUSE-SU-2021:1840-1

SUSE-SU-2021:1840-2

USN-4943-1

USN-6978-1

Affected Products

Alt Linux

Astra Linux

Centos

Linuxmint

Red Hat

Suse

Ubuntu

Xstream

References · 125

• 🔥 https://x-stream.github.io/CVE-2021-21345.html · Exploit
• https://ubuntu.com/security/notices/USN-4943-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21351 · Security Note
• https://osv.dev/vulnerability/MGASA-2021-0370 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/683476 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-21343 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-21345 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-1354.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-21351 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21342 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-21349 · Security Note
• https://ubuntu.com/security/CVE-2021-21341 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-21349 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21345 · Security Note