What is CVE-2020-17531?

CVE-2020-17531 is a critical-severity vulnerability in Apache Tapestry, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2020-12-08.

How severe is CVE-2020-17531?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-17531 known to be exploited?

14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Apache Tapestry

CVE-2020-17531

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.

Vulnerability class: Insecure Deserialization

EPSS: 0.100 (95.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Tapestry
Apache Software Foundation Tapestry — versions Apache Tapestry 4

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

security@apache.org (Mailing List, Vendor Advisory)
security@apache.org (Third Party Advisory)
security@apache.org (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-17531?: CVE-2020-17531 is a critical-severity vulnerability in Apache Tapestry, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2020-12-08.
How severe is CVE-2020-17531?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-17531 known to be exploited?: 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.