CVE-2021-39140: debian debian_linux Deserialization of Untrusted Data

Vulnerability summary

CVE-2021-39140 is a medium (CVSS 6.5) Deserialization of Untrusted Data vulnerability in debian debian_linux. EPSS estimates a 5.92% chance of exploitation in the next 30 days, higher than 93.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 23-08-2021
   PublishedVulnerability first disclosed.
2. 07-10-2026
   Last modifiedVulnerability information updated.

Description

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability 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. 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.

• CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.