CVE-2020-9493: apache software foundation apache chainsaw Deserialization of Untrusted Data
CVSS: 9.8v3.1CriticalModified
Published 16-06-2021Last modified 07-10-2026
Vulnerability summary
CVE-2020-9493 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in apache software foundation apache chainsaw. EPSS estimates a 4.61% chance of exploitation in the next 30 days, higher than 91.5% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
4.61%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 16-06-2021PublishedVulnerability first disclosed.
- 07-10-2026Last modifiedVulnerability information updated.
Description
A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
4.61%
Chance of exploitation in the next 30 days
Percentile
92%
Versus all other CVEs
30-day change
+0.02 pp
From 4.59% on 18-09-2026
18-09-202618-10-2026
EPSS score4.61%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Apache software foundation1 product
- apache chainsaw≥ Apache Chainsaw, < 2.1.0
Qos1 product
- reload4j< 1.2.18.1
3 vendors · 4 products