CVE-2020-17531

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 9.7%, top 5% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 10%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
10%
EPSS %ILE
95%
KEV
Not listed

Published

December 8, 2020

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Sep 13, 2026
No patch confirmed yet.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20210115-0007/
generic
https://lists.apache.org/thread.html/r700a6aa234dbff0555d4187bdc8274d7e4c0afbf35b9a3457f09ee76%40%3Cusers.tapestry.apache.org%3E
generic

oss-security - CVE-2022-46366: Apache Tapestry prior to version 4 (EOL) allows RCE though deserialization of untrusted input

http://www.openwall.com/lists/oss-security/2022/12/02/1

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.apache.tapestry:tapestry-project4.1 ... 4.1.6 (6 versions)5.0.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 27× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-09-19 21:30 UTCOSV refresh
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:22 UTCEPSS rescore
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  1. 2026-08-21 23:45 UTCEPSS rescore
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  30. 2026-07-23 01:50 UTCEG score recompute
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  47. 2026-07-12 05:44 UTCEPSS rescore
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  72. 2026-06-23 21:31 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2020-17531?
CVE-2020-17531 is a critical vulnerability published on December 8, 2020. 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…
When was CVE-2020-17531 disclosed?
CVE-2020-17531 was first published in the National Vulnerability Database on December 8, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-17531 actively exploited?
CVE-2020-17531 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10% probability of exploitation in the next 30 days, which ranks it in the top 4.6% of all scored CVEs.
What is the CVSS score of CVE-2020-17531?
CVE-2020-17531 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-17531?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-17531, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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