How severe is CVE-2020-9493?

CVE-2020-9493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-9493 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-9493?

CVE-2020-9493 primarily affects Apache Chainsaw. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-9493?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2020-9493 published?

CVE-2020-9493 was published on 2021-06-16 and last updated on 2026-06-17.

CVE-2020-9493

CVE-2020-9493 is a critical-severity vulnerability in Apache Chainsaw with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 6.8
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Apache Chainsaw
Published: 2021-06-16
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2020-9493?: A deserialization flaw was found in Apache Chainsaw versions prior to 2.1.0 which could lead to malicious code execution.
How severe is CVE-2020-9493?: CVE-2020-9493 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-9493 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-9493?: CVE-2020-9493 primarily affects Apache Chainsaw. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-9493?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-9493 published?: CVE-2020-9493 was published on 2021-06-16 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:apache:chainsaw:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
cpe:2.3:a:qos:reload4j:*:*:*:*:*:*:*:*

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