CVE-2020-9493 | Java deserialization in Chainsaw

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

Published: 2021-06-16 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-9493 is rated Moderate Risk (59.3/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.35%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-9493

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-28 0.36% 0.35% -0.01%
2 2026-05-22 0.35% 0.36% +0.01%
3 2025-11-22 — 0.35% —

Full EPSS history (29 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-9493

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2020-9493

OS Trackers for CVE-2020-9493

vendor priority summary link
gentoo normal CVE-2020-9493: 1 GLSA(s) (202402-16), 1 atom(s) (dev-java/log4j); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-9493
suse high CVE-2020-9493 severity important: SUSE including 4 source package names (log4j, log4j-javadoc, log4j-jcl, log4j-slf4j), 4 product×package rows across 1 product lines (SUSE Linux Enterprise Module for Basesystem 15 SP3): Known Not Affected 4. https://www.suse.com/security/cve/CVE-2020-9493/

Affected software / configurations for CVE-2020-9493

Vendor Product Version Raw CPE
apache chainsaw < 2.1.0 cpe:2.3:a:apache:chainsaw:*:*:*:*:*:*:*:*
apache log4j >= 1.2, < 2.0 cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
qos reload4j < 1.2.18.1 cpe:2.3:a:qos:reload4j:*:*:*:*:*:*:*:*

References for CVE-2020-9493

cvelogic Threat Intelligence