CVE-2021-21345
XStream is vulnerable to a Remote Command Execution attack
Description
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker who has sufficient rights to execute commands of the 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.
How to fix CVE-2021-21345
To remediate CVE-2021-21345, upgrade the affected package to a fixed version below.
- —upgrade to 5.15.14 or later
- —upgrade to 1.4.15-2 or later
- —upgrade to 1.4.16 or later
Is CVE-2021-21345 being exploited?
Likely — EPSS is 88.1%, placing CVE-2021-21345 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (3)
- from 0, < 5.15.14 | >= 5.16.0, <= 5.16.0, >= 5.16.1, <= 5.16.1
- from 0, < 1.4.15-2
- from 0, < 1.4.16
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N |