CVE-2021-39139
HIGHCVSS 8.8/10EPSS 4.58%
Last modified
CVE-2021-39139 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. EPSS estimates a 4.58% chance of exploitation in the next 30 days.
Description
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. A user is only affected if using the version out of the box with JDK 1.7u21 or below. However, this scenario can be adjusted easily to an external Xalan that works regardless of the version of the Java runtime. 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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Xstream | Xstream | < 1.4.18 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
| Fedoraproject | Fedora | 33 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Fedora | 35 |
| Netapp | Snapmanager | All versions |
| Oracle | Business Activity Monitoring | 12.2.1.4.0 |
| Oracle | Commerce Guided Search | 11.3.2 |
| Oracle | Communications Billing And Revenue Management Elastic Charging Engine | 11.3 |
| Oracle | Communications Billing And Revenue Management Elastic Charging Engine | 12.0 |
| Oracle | Communications Cloud Native Core Automated Test Suite | 1.9.0 |
| Oracle | Communications Cloud Native Core Binding Support Function | 1.10.0 |
| Oracle | Communications Cloud Native Core Policy | 1.14.0 |
| Oracle | Communications Unified Inventory Management | 7.3.4 |
| Oracle | Communications Unified Inventory Management | 7.3.5 |
| Oracle | Communications Unified Inventory Management | 7.4.0 |
| Oracle | Communications Unified Inventory Management | 7.4.1 |
| Oracle | Communications Unified Inventory Management | 7.4.2 |
| Oracle | Retail Xstore Point Of Service | 16.0.6 |
| Oracle | Retail Xstore Point Of Service | 17.0.4 |
| Oracle | Retail Xstore Point Of Service | 18.0.3 |
| Oracle | Retail Xstore Point Of Service | 19.0.2 |
| Oracle | Retail Xstore Point Of Service | 20.0.1 |
| Oracle | Utilities Framework | 4.2.0.2.0 |
| Oracle | Utilities Framework | 4.2.0.3.0 |
| Oracle | Utilities Framework | 4.3.0.1.0 |
| Oracle | Utilities Framework | 4.3.0.6.0 |
| Oracle | Utilities Framework | 4.4.0.0.0 |
| Oracle | Utilities Framework | 4.4.0.2.0 |
| Oracle | Utilities Framework | 4.4.0.3.0 |
| Oracle | Utilities Testing Accelerator | 6.0.0.1.1 |
| Oracle | Webcenter Portal | 12.2.1.3.0 |
| Oracle | Webcenter Portal | 12.2.1.4.0 |
References
- https://github.com/x-stream/xstream/security/advisories/GHSA-64xx-cq4q-mf44Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00017.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210923-0003/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5004Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://x-stream.github.io/CVE-2021-39139.htmlVendor Advisory
- https://github.com/x-stream/xstream/security/advisories/GHSA-64xx-cq4q-mf44Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00017.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210923-0003/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5004Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://x-stream.github.io/CVE-2021-39139.htmlVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-39139?
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to load and execute arbitrary code from a remote host only by manipulating the processed input stream. A user is only affected if using the version out of the box with JDK 1.7u21 or below. However, this scenario can be adjusted easily to an external Xalan that works regardless of the version of the Java runtime. 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.
How severe is CVE-2021-39139?
CVE-2021-39139 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.58% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39139?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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