THREATPORT/VULNERABILITY/CVE-2021-39151
HIGH SEVERITY

CVE-2021-39151

Xstream vulnerability

CVSS
8.5
EPSS
4.7%
EPSS pct
91th
Exploited
No known
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.
Affected vendor
Xstream
Affected product
Xstream
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-434 — Unrestricted Upload of File with Dangerous Type
  • CWE-502 — Deserialization of Untrusted Data
Published
2021-08-23

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 4.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 91% of all scored CVEs.

Check your external exposure to CVE-2021-39151

  • Confirm whether Xstream Xstream is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-39151.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-39151

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