CVE-2021-39139
No exploitation reported by the sources we read.
- Published2021-08-23
- WeaknessCWE-434 · CWE-502
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2021-08-2318:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-39139?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-39139?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.2 | = 4.2.0.2.0 | no fix published | NVD |
| 4.2 | = 4.2.0.3.0 | no fix published | NVD |
| 4.3 | = 4.3.0.1.0 | no fix published | NVD |
| 4.3 | = 4.3.0.6.0 | no fix published | NVD |
| 4.4 | = 4.4.0.0.0 | no fix published | NVD |
| 4.4 | = 4.4.0.2.0 | no fix published | NVD |
| 4.4 | = 4.4.0.3.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.3 | = 7.3.4 | no fix published | NVD |
| 7.3 | = 7.3.5 | no fix published | NVD |
| 7.4 | = 7.4.0 | no fix published | NVD |
| 7.4 | = 7.4.1 | no fix published | NVD |
| 7.4 | = 7.4.2 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 16.0 | = 16.0.6 | no fix published | NVD |
| 17.0 | = 17.0.4 | no fix published | NVD |
| 18.0 | = 18.0.3 | no fix published | NVD |
| 19.0 | = 19.0.2 | no fix published | NVD |
| 20.0 | = 20.0.1 | no fix published | NVD |
12 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- www.oracle.comPatch
- www.oracle.comPatch
- www.oracle.comPatch
- x-stream.github.ioVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2021-08-23
- Last Modified
- 2026-10-07
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2021-39139?
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What is the CVSS score for CVE-2021-39139?
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