CVE-2021-42242Public exploitNetwork attack vector

Authenticated command execution via Fastjson deserialization

Published May 5, 2022 · Updated Aug 4, 2024

Deserialization in jfinal_cms 5.0.1 allows remote authenticated users to execute commands through the Ueditor route. The ConfigManager initEnv method parses attacker-controlled WEB-INF/classes/config.json with Fastjson JSONObject.parseObject, instantiating a JNDI-capable object that loads code from an RMI or LDAP endpoint. Exploitation requires backstage template-management access to replace config.json; visiting /ueditor then executes the payload with server privileges.

CVSS severity9.8
Critical
EPSS probability2.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in jfinal_cms 5.0.1 allows remote authenticated users to execute commands through the Ueditor route. The ConfigManager initEnv method parses attacker-controlled WEB-INF/classes/config.json with Fastjson JSONObject.parseObject, instantiating a JNDI-capable object that loads code from an RMI or LDAP endpoint. Exploitation requires backstage template-management access to replace config.json; visiting /ueditor then executes the payload with server privileges.

The record

CVE
CVE-2021-42242
Published
May 5, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2022CVE 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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