THREATPORT/VULNERABILITY/CVE-2021-39150
HIGH SEVERITY

CVE-2021-39150

Xstream vulnerability

CVSS
8.5
EPSS
3.4%
EPSS pct
88th
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 request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. 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](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.
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-502 — Deserialization of Untrusted Data
  • CWE-918 — Server-Side Request Forgery (SSRF)
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 3.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2021-39150

  • Confirm whether Xstream Xstream is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-39150.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-39150

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