CVE-2025-29953Network attack vector

Remote code execution via null-type allowlist bypass

Published Apr 18, 2025 · Updated Apr 23, 2025

Unsafe deserialization in Apache ActiveMQ NMS OpenWire Client before 2.1.1 allows remote attackers to execute code through a malicious broker. TrustedClassFilter resolves a crafted assembly-qualified type to null, while NmsDefaultDeserializationPolicy treats the null type name as trusted and permits fallback type resolution. Exploitation requires a client application to connect to an untrusted or attacker-controlled OpenWire server and deserialize a malicious ObjectMessage body.

CVSS severity9.8
Critical
EPSS probability2.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in Apache ActiveMQ NMS OpenWire Client before 2.1.1 allows remote attackers to execute code through a malicious broker. TrustedClassFilter resolves a crafted assembly-qualified type to null, while NmsDefaultDeserializationPolicy treats the null type name as trusted and permits fallback type resolution. Exploitation requires a client application to connect to an untrusted or attacker-controlled OpenWire server and deserialize a malicious ObjectMessage body.

The record

CVE
CVE-2025-29953
Published
Apr 18, 2025
Updated
Apr 23, 2025
Vendor
The Apache Software Foundation
Product
Apache ActiveMQ NMS OpenWire Client
Classifications
CWE-502, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=0 <2.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache ActiveMQ NMS OpenWire Clientversion=0 <2.1.1

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1203Exploitation for Client Execution

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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