CVE-2022-25867Network attack vector

Client crash via unchecked event payload

Published Aug 2, 2022 · Updated Sep 16, 2024

Null pointer dereference in Socket.IO Client Java before 2.0.1 allows remote attackers to crash client applications via malformed event payloads. IOParser.decodeString accepts an EVENT or BINARY_EVENT payload whose array is empty or begins with null, then Socket.onevent calls toString on the missing first element. A server able to send such a packet can terminate the client's event thread and interrupt the embedding application.

CVSS severity7.5
High
EPSS probability1.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Socket.IO Client Java before 2.0.1 allows remote attackers to crash client applications via malformed event payloads. IOParser.decodeString accepts an EVENT or BINARY_EVENT payload whose array is empty or begins with null, then Socket.onevent calls toString on the missing first element. A server able to send such a packet can terminate the client's event thread and interrupt the embedding application.

The record

CVE
CVE-2022-25867
Published
Aug 2, 2022
Updated
Sep 16, 2024
Vendor
Socket.IO
Product
Socket.IO Client Java
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 2, 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 <2.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Socket.IO · Socket.IO Client Javaversion=unspecified <2.0.1

Published CVSS scores

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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation Flood

Public exploit references

No public exploit references are available in this record.

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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