CVE-2021-39139
high-risk
Published 2021-08-23
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. A user is only affected if using the version out of the box with JDK 1.7u21 or below. However, this scenario can be adjusted easily to an external Xalan that works regardless of the version of the Java runtime. 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.
Do I need to act?
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0.84% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.5/10
High
NETWORK
/ HIGH complexity
Affected Products (20)
Affected Vendors
References (22)
Third Party Advisory
https://github.com/x-stream/xstream/security/advisories/GHSA-64xx-cq4q-mf44
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210923-0003/
Third Party Advisory
https://www.debian.org/security/2021/dsa-5004
Vendor Advisory
https://x-stream.github.io/CVE-2021-39139.html
Third Party Advisory
https://github.com/x-stream/xstream/security/advisories/GHSA-64xx-cq4q-mf44
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210923-0003/
Third Party Advisory
https://www.debian.org/security/2021/dsa-5004
and 2 more references
51
/ 100
high-risk
Severity
25/34 · High
Exploitability
3/34 · Minimal
Exposure
23/34 · High