8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2020-1714

CVE-2020-1714: Improper Input Validation in Keycloak

A flaw was found in Keycloak before version 11.0.0, where the code base contains usages of ObjectInputStream without type checks. This flaw allows an attacker to inject arbitrarily serialized Java Objects, which would then get deserialized in a privileged context and potentially lead to remote code execution.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2020-1714

CVE-2020-1714:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.keycloak:keycloak-core	maven	< 11.0.0	11.0.0
org.keycloak:keycloak-common	maven	< 11.0.0	11.0.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from unsafe deserialization via ObjectInputStream without type validation. The commit adds DelegatingSerializationFilter to readObject() methods across multiple classes to restrict allowed classes. The presence of these patches directly indicates that the original implementations in these locations performed deserialization without proper input validation. Files like OIDCFilterSessionStore.java and CatalinaSessionTokenStore.java show added readObject() methods with validation, implying prior insecure implementations. Similarly, KerberosSerializationUtils.java modified its deserialization logic to include filtering. These locations would have been entry points for malicious serialized objects before the fix.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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