What is CVE-2025-29953?

CVE-2025-29953 is a critical-severity vulnerability in Apache Activemq Nms Openwire, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-04-18.

How severe is CVE-2025-29953?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-29953 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Apache Activemq Nms Openwire

CVE-2025-29953

Deserialization of Untrusted Data vulnerability in Apache ActiveMQ NMS OpenWire Client. This issue affects Apache ActiveMQ NMS OpenWire Client before 2.1.1 when performing connections to untrusted servers. Such servers could abuse the unbounded deserialization in the client to provide malicious responses that may eventually cause arbitrary code execution on the client. Version 2.1.0 introduced a allow/denylist feature to restrict deserialization, but this feature could be bypassed. The .NET team has deprecated the built-in .NET binary serialization feature starting with .NET 9 and suggests migrating away from binary serialization. The project is considering to follow suit and drop this part of the NMS API altogether. Users are recommended to upgrade to version 2.1.1, which fixes the issue. We also recommend to migrate away from relying on .NET binary serialization as a hardening method for the future.

Vulnerability class: Insecure Deserialization

Published 2025-04-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.021 · change: +0.002

Affected products

Apache Activemq Nms Openwire
Apache Software Foundation Activemq Nms Openwire Client — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

lists.apache.org/thread/vc1sj9y3056d3kkhcvrs9fyw5w8kpmlx (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2025-29953?: CVE-2025-29953 is a critical-severity vulnerability in Apache Activemq Nms Openwire, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2025-04-18.
How severe is CVE-2025-29953?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-29953 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.