CVE-2020-9493

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 5%CVSS: 9.8Exploit: NoneExposed: 0

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

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

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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%
Exploitation5% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
90.7%
KEV
Not listed

Published

June 16, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated May 26, 2026
No patch confirmed yet.
generic

oss-security - CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw

https://www.openwall.com/lists/oss-security/2021/06/16/1
generic
https://lists.apache.org/thread.html/r50d389c613ba6062a26aa57e163c09bfee4ff2d95d67331d75265b83%40%3Cannounce.apache.org%3E
generic

oss-security - CVE-2022-23307: Apache Log4j 1.x: A deserialization flaw in the Chainsaw component of Log4j 1 can lead to malicious code execution.

http://www.openwall.com/lists/oss-security/2022/01/18/5
generic

oss-security - CVE-2020-9493: Apache Chainsaw: Java deserialization in Chainsaw

http://www.openwall.com/lists/oss-security/2021/06/16/1

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 50× 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 103 total refreshes for this CVE.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:55 UTCEG score recompute
  3. 2026-07-22 22:42 UTCEG score recompute
  4. 2026-07-22 14:05 UTCEPSS rescore
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  13. 2026-07-18 18:29 UTCOSV refresh
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  1. 2026-07-11 08:25 UTCEPSS rescore
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  5. 2026-07-06 16:25 UTCEPSS rescore
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  12. 2026-07-02 16:57 UTCEPSS rescore
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  14. 2026-07-01 01:18 UTCOSV refresh
  15. 2026-06-30 23:20 UTCEPSS rescore
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  32. 2026-06-19 19:24 UTCEPSS rescore
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  39. 2026-06-14 23:15 UTCEPSS rescore
  40. 2026-06-13 22:58 UTCEPSS rescore
  41. 2026-06-13 22:58 UTCEPSS rescore
  42. 2026-06-13 03:38 UTCOSV refresh
  43. 2026-06-12 23:10 UTCEPSS rescore
  44. 2026-06-12 23:10 UTCEPSS rescore
  45. 2026-06-11 13:58 UTCEPSS rescore
  46. 2026-06-11 13:58 UTCEPSS rescore
  47. 2026-06-10 22:16 UTCEPSS rescore
  48. 2026-06-10 13:20 UTCEPSS rescore
  49. 2026-06-08 14:15 UTCEPSS rescore
  50. 2026-06-07 15:23 UTCEPSS rescore
  51. 2026-06-07 15:23 UTCEPSS rescore
  52. 2026-06-06 13:46 UTCEPSS rescore
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  63. 2026-06-01 13:50 UTCEPSS rescore
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  71. 2026-05-27 13:39 UTCEPSS rescore
  72. 2026-05-27 13:39 UTCEPSS rescore
  73. 2026-05-26 14:52 UTCEG score recompute
  74. 2026-05-26 14:51 UTCGHSA enrichment
  75. 2026-05-26 13:42 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-9493?
CVE-2020-9493 is a critical vulnerability published on June 16, 2021. A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.
When was CVE-2020-9493 disclosed?
CVE-2020-9493 was first published in the National Vulnerability Database on June 16, 2021, 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-2020-9493 actively exploited?
CVE-2020-9493 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-9493?
CVE-2020-9493 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-9493?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9493, 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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