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CVE-2021-43859

high CVSS 7.5 EPSS 7.9%

XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible.

Versions it affects

Software versions checked with the free lookup that CVE-2021-43859 applies to, and the release that fixes it where the sources name one.

Jenkins 1.509 fixed in 2.319.3

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
7.9% probability of exploitation in the next 30 days, higher than 95% of scored vulnerabilities
Weakness
CWE-400
Published
2022-02-01
NVD CVE.org

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