CVE-2020-11995: Apache Dubbo default deserialization protocol Hessian2 cause CRE

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-11 · updated 2026-06-17
Weakness: CWE-502

Description

A deserialization vulnerability existed in dubbo 2.7.5 and its earlier versions, which could lead to malicious code execution. Most Dubbo users use Hessian2 as the default serialization/deserialization protool, during Hessian2 deserializing the HashMap object, some functions in the classes stored in HasMap will be executed after a series of program calls, however, those special functions may cause remote command execution. For example, the hashCode() function of the EqualsBean class in rome-1.7.0.jar will cause the remotely load malicious classes and execute malicious code by constructing a malicious request. This issue was fixed in Apache Dubbo 2.6.9 and 2.7.8.

Affected products

Apache Software Foundation Apache Dubbo: from 2.5.0 through 2.5.10; from 2.6.0 through 2.6.8; from 2.7.0 through 2.7.7

References

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