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Back to active CVEs
Critical · CVSS 9.8CVE-2020-9493

Java deserialization in ChainsawCVE-2020-9493

Answer in brief

CVE-2020-9493 records a Critical severity (CVSS 9.8) vulnerability in Java deserialization in Chainsaw. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Chainsaw (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 16, 2021Updated Oct 7, 2026Source checked Oct 7, 2026First seen by HOL Oct 7, 2026Material review Oct 7, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Chainsaw (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Chainsawgeneric>=Apache Chainsaw <2.1.02.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Chainsaw.
  2. 2Review the reported fix. Source-reported workaround: Don't configure Chainsaw to read serialized log events. Use a different receiver, such as XMLSocketReceiver

Evidence timeline and material changes

  1. Published upstream

    Jun 16, 2021

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 7, 2026

Sources and claim methodology

  • Source referencelists.apache.org
  • Source referenceopenwall.com
  • Source referenceopenwall.com
  • Source referenceopenwall.com
Upstream source description

A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Deserialization
EPSS
Not reported
CWE IDs
CWE-502
Source
CVE List V5
Source checked
Oct 7, 2026
References
4 linked sources
Open source record