CVE-2020-11995: apache software foundation apache dubbo Deserialization of Untrusted Data
Vulnerability summary
CVE-2020-11995 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in apache software foundation apache dubbo. EPSS estimates a 5.93% chance of exploitation in the next 30 days, higher than 93.1% of scored vulnerabilities.
Timeline
- 11-01-2021PublishedVulnerability first disclosed.
- 13-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · MavenEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
5.93%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
+0.24 pp
From 5.68% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Apache1 product
- dubbo≥ 2.5.0, ≤ 2.5.10 | ≥ 2.6.0, ≤ 2.6.8 | ≥ 2.7.0, ≤ 2.7.7
Apache software foundation1 product
- apache dubbo≥ Apache Dubbo, < 2.6.9
Org.apache.dubbo1 product
- dubbo-parent≥ 2.7.0, < 2.7.8 | < 2.6.9
3 vendors · 3 products
