CVE-2020-17531

Deserialization flaw in EOL Tapestry 4.

CRITICAL
9.8
CVSS Score
Published: December 8, 2020 at 12:00 AM UTC
Updated: June 17, 2026 at 02:59 AM UTC
1 product affected across 1 vendorTapestry

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Severity
CRITICAL9.8
Exploit prediction
EPSS 10%

Description

A Java Serialization vulnerability was found in Apache Tapestry 4. Apache Tapestry 4 will attempt to deserialize the "sp" parameter even before invoking the page's validate method, leading to deserialization without authentication. Apache Tapestry 4 reached end of life in 2008 and no update to address this issue will be released. Apache Tapestry 5 versions are not vulnerable to this issue. Users of Apache Tapestry 4 should upgrade to the latest Apache Tapestry 5 version.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

4.0.0 ≤ v < 5.0.1Apache Tapestry 4 ≤ v ≤ 4Apache Tapestry 4
Affected range stops below 5.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502

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