CVE-2025-65953
CVE-2025-65953 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.0. 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-416.
Key facts
- Severity: Medium (CVSS 4.0 base score 6.0)
- EPSS exploit prediction: 0% (9th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-199658
- Weakness: CWE-416
- Published:
- Last modified:
Description
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.22.5, a Heap-Use-After-Free (UAF) vulnerability exists in the TCP transport component of NanoMQ, which relies on the underlying NanoNNG library (specifically in src/sp/transport/mqtt/broker_tcp.c). The vulnerability is due to improper resource management and premature cleanup of message and pipe structures under specific malformed MQTTV5 retain message traffic conditions. This issue has been patched in version 0.22.5.
Frequently asked questions
- What is CVE-2025-65953?
- NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.22.5, a Heap-Use-After-Free (UAF) vulnerability exists in the TCP transport component of NanoMQ, which relies on the underlying NanoNNG library (specifically in src/sp/transport/mqtt/broker_tcp.c). The vulnerability is due to improper resource management and premature cleanup of message and pipe structures under specific malformed MQTTV5 retain message traffic conditions. This issue has been patched in version 0.22.5.
- How severe is CVE-2025-65953?
- CVE-2025-65953 has a CVSS 4.0 base score of 6.0, rated medium severity.
- Is CVE-2025-65953 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2025-65953?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-65953 have an EU (EUVD) identifier?
- Yes. CVE-2025-65953 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199658.
- When was CVE-2025-65953 published?
- CVE-2025-65953 was published on 2025-11-25 and last updated on 2026-06-17.
References
Other CWE-416 (Use After Free) vulnerabilities
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