CVE-2022-25845Public exploitNetwork attack vector

Remote server compromise via autoType bypass

Published Jun 10, 2022 · Updated Sep 16, 2024

Deserialization of untrusted data in Alibaba Group Fastjson before 1.2.83 allows remote attackers to compromise servers via crafted JSON. ParserConfig.checkAutoType accepts attacker-controlled @type values when default autoType shutdown restrictions are bypassed, enabling unsafe Java object deserialization. The attack requires a remotely reachable application that passes untrusted JSON to Fastjson; resulting compromise can affect confidentiality, integrity, and availability.

CVSS severity9.8
Critical
EPSS probability18.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Alibaba Group Fastjson before 1.2.83 allows remote attackers to compromise servers via crafted JSON. ParserConfig.checkAutoType accepts attacker-controlled @type values when default autoType shutdown restrictions are bypassed, enabling unsafe Java object deserialization. The attack requires a remotely reachable application that passes untrusted JSON to Fastjson; resulting compromise can affect confidentiality, integrity, and availability.

The record

CVE
CVE-2022-25845
Published
Jun 10, 2022
Updated
Sep 16, 2024
Vendor
Alibaba Group
Product
Fastjson
Classifications
CWE-502, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <1.2.83

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Alibaba Group · Fastjsonversion=unspecified <1.2.83

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1SnykCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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 exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution

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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