CVE-2021-39145
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. 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 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-39145?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-39145?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:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Published
- 2021-08-23
- Last Modified
- 2026-10-07
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2021-39145?
Is CVE-2021-39145 actively exploited?
What is the CVSS score for CVE-2021-39145?
Running xstream? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Go further
- Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
- Running this software? Vulnerability monitoring alerts you to new vulnerabilities in your products.
Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.