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Medium

A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host

  • Disclosed: 22.03.2021
  • Updated: 11.10.2026 12:22

Impact

The processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types.

Patches

If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16

Workarounds

See workarounds for the different versions covering all CVEs.

References

See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for CVE-2021-21342.

Credits

钟潦贵 (Liaogui Zhong) found and reported the issue to XStream and provided the required information to reproduce it.

For more information

If you have any questions or comments about this advisory:

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Java / Kotlin (Maven) com.thoughtworks.xstream:xstream < 1.4.16 1.4.16

References

CVSS score 5.3/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness (CWE)
CWE-502, CWE-918
Platform
Java / Kotlin (Maven)
Package
com.thoughtworks.xstream:xstream
Disclosed
22.03.2021
Updated
11.10.2026 12:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-hvv8-336g-rx3m - CC BY 4.0

Vulnerability history: com.thoughtworks.xstream:xstream

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (37) in the archive
Total entries
37
First → latest
05.2019 11.2024
Without a fix
0
Exploited in attacks
1

Severity breakdown

  • Critical 2
  • High 22
  • Medium 13

Disclosures per year

Severity:
  1. XStream is vulnerable to a Denial of Service attack due to stack overflow from a manipulated binary input stream
    High · 7.5 CVE-2024-47072 < 1.4.21 1.4.21
  2. XStream can cause a Denial of Service by injecting deeply nested objects raising a stack overflow
    High · 7.5 CVE-2022-40151 < 1.4.20 1.4.20
  3. XStream can cause Denial of Service via stack overflow
    High · 8.2 CVE-2022-41966 < 1.4.20 1.4.20
  4. Denial of Service by injecting highly recursive collections or maps in XStream
    High · 7.5 CVE-2021-43859 < 1.4.19 1.4.19
  5. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39139 < 1.4.18 1.4.18
  6. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39141 < 1.4.18 1.4.18
  7. XStream is vulnerable to a Remote Command Execution attack
    High · 8.5 Exploited in attacks CVE-2021-39144 < 1.4.18 1.4.18
  8. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39145 < 1.4.18 1.4.18
  9. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39146 < 1.4.18 1.4.18
  10. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39147 < 1.4.18 1.4.18
  11. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39148 < 1.4.18 1.4.18
  12. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39149 < 1.4.18 1.4.18
  13. A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host
    High · 8.5 CVE-2021-39150 < 1.4.18 1.4.18
  14. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39151 < 1.4.18 1.4.18
  15. A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host
    High · 8.5 CVE-2021-39152 < 1.4.18 1.4.18
  16. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39153 < 1.4.18 1.4.18
  17. XStream is vulnerable to an Arbitrary Code Execution attack
    High · 8.5 CVE-2021-39154 < 1.4.18 1.4.18
  18. XStream is vulnerable to a Remote Command Execution attack
    High · 7.5 CVE-2021-29505 < 1.4.17 1.4.17
  19. A Server-Side Forgery Request can be activated unmarshalling with XStream to access data streams from an arbitrary URL referencing a resource in an intranet or the local host this entry
    Medium · 5.3 CVE-2021-21342 < 1.4.16 1.4.16
  20. XStream can cause a Denial of Service.
    High · 7.5 CVE-2021-21341 < 1.4.16 1.4.16
Show more (5) Showing 20 of 25

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