Arbitrary file upload in Apache Activemq

CVE-2021-21351

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a 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. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Vulnerability class: Unrestricted File Upload

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.821 (99.7th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-21351: held from 0.821 to 0.821.

EPSS over last 30 days · oldest: 0.821 · newest: 0.821 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-21351?
CVE-2021-21351 is a medium-severity vulnerability in Apache Activemq, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.4/10. Published 2021-03-23.
How severe is CVE-2021-21351?
Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-21351 known to be exploited?
12 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.