CVE-2021-39144
KEVHIGH 8.5EPSS 98.1%
XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker 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. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.
- CVSS v3.1
- 8.5 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS v3.1
- 8.5 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS v3.1
- 8.5 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H - CVSS v2.0
- 6.0 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P - EPSS
- 98.12% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2023-03-10
- Nuclei
- high
- Published
- 2021-08-23
- Updated
- 2025-10-21
Proof-of-concept exploits (2)
- http://packetstormsecurity.com/files/169859/VMware-NSX-Manager-XStream-Unauthenticated-Re…
- zwjjustdoit/Xstream-1.4.1762★ · 2021-08-25