How severe is CVE-2025-29953?

CVE-2025-29953 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-29953 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-29953?

CVE-2025-29953 affects Apache Activemq Nms Openwire. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-29953?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-29953 have an EU (EUVD) identifier?

Yes. CVE-2025-29953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11871.

When was CVE-2025-29953 published?

CVE-2025-29953 was published on 2025-04-18 and last updated on 2026-06-17.

CVE-2025-29953

CVE-2025-29953 is a critical-severity vulnerability in Apache Activemq Nms Openwire with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-11871
Weakness: CWE-502
Affected product: Apache Activemq Nms Openwire
Published: 2025-04-18
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-29953?: CVE-2025-29953 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-29953 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-29953?: CVE-2025-29953 affects Apache Activemq Nms Openwire. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-29953?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-29953 have an EU (EUVD) identifier?: Yes. CVE-2025-29953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-11871.
When was CVE-2025-29953 published?: CVE-2025-29953 was published on 2025-04-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:activemq_nms_openwire:*:*:*:*:*:*:*:*

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