What is the CVSS score of CVE-2021-39140?

CVE-2021-39140 has a CVSS 3.1 base score of 6.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H. EPSS exploitation probability: 5.9%.

Is there a public PoC exploit available for CVE-2021-39140?

Yes, a public proof-of-concept exploit is available for CVE-2021-39140. Prioritise patching immediately. EPSS: 5.9%.

Is there a patch available for CVE-2021-39140?

Yes, a patch is available for CVE-2021-39140. Update the affected software to the latest version immediately.

Xstream CVE-2021-39140

MEDIUM

Deserialization of Untrusted Data (CWE-502)

2021-08-23 security-advisories@github.com

Deserialization Denial Of Service Xstream Debian Linux Fedora Snapmanager Business Activity Monitoring Commerce Guided Search Communications Billing And Revenue Management Elastic Charging Engine Communications Cloud Native Core Automated Test Suite Communications Cloud Native Core Binding Support Function Communications Cloud Native Core Policy Communications Unified Inventory Management Retail Xstore Point Of Service Utilities Framework Utilities Testing Accelerator Webcenter Portal

6.3

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.3 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Aug 23, 2021 - 19:15 nvd

MEDIUM 6.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1,776 maven packages depend on com.thoughtworks.xstream:xstream (204 direct, 1,575 indirect)

Ecosystem-wide dependent count for version 1.4.18.

DescriptionNVD

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service 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.

AnalysisAI

XStream is a simple library to serialize objects to XML and back again. Rated medium severity (CVSS 6.3), this vulnerability is remotely exploitable. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Deserialization of Untrusted Data (CWE-502), which allows attackers to execute arbitrary code through malicious serialized objects. XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service 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. Affected products include: Xstream, Debian Debian Linux, Fedoraproject Fedora, Netapp Snapmanager, Oracle Business Activity Monitoring.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Avoid deserializing untrusted data. Use safe serialization formats (JSON). Implement integrity checks and type allowlists.