CVE•Published 2021-05-28•Modified 2026-10-07•1 article on news•5 live references•NVD data

CVE-2021-29505Xstream · Xstream

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

100

Exploit Prediction Scoring System · top 0% of all CVEs

Weaknesses (CWE)

CWE-94Improper Control of Generation of Code ('Code Injection')CWE-502Deserialization of Untrusted Data

Description

XStream is software for serializing Java objects to XML and back again. A vulnerability in XStream versions prior to 1.4.17 may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types is affected. The vulnerability is patched in version 1.4.17.

Timeline

Published 2021-05-28

Modified 2026-10-07

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag3 hosts

vuln:CVE-2021-29505

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Xstream Xstream"

All exposed Xstream Xstream instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Xstream"

HTTP body or banner mentions "Xstream" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2021-29505