CVE-2020-9546Network attack vector

Remote code execution via shaded HikariConfig gadget

Published Mar 2, 2020 · Updated Aug 4, 2024

Deserialization in FasterXML jackson-databind 2.x before 2.9.10.4 allows remote attackers to execute code through crafted JSON. SubTypeValidator omits org.apache.hadoop.shaded.com.zaxxer.hikari.HikariConfig from its blocked subtype set, allowing class-name polymorphic typing to instantiate and populate the gadget from attacker-controlled properties. Exploitation requires untrusted JSON input, permissive polymorphic typing, and the shaded HikariConfig class on the application classpath.

CVSS severity9.8
Critical
EPSS probability4.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in FasterXML jackson-databind 2.x before 2.9.10.4 allows remote attackers to execute code through crafted JSON. SubTypeValidator omits org.apache.hadoop.shaded.com.zaxxer.hikari.HikariConfig from its blocked subtype set, allowing class-name polymorphic typing to instantiate and populate the gadget from attacker-controlled properties. Exploitation requires untrusted JSON input, permissive polymorphic typing, and the shaded HikariConfig class on the application classpath.

The record

CVE
CVE-2020-9546
Published
Mar 2, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 2, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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