CVE-2025-63235

7.5 highEPSS 0.4%

High (7.5). EPSS 0.4% chance of exploitation in the next 30 days.

In sol commit 373d848 (2024-12-12), the broker does not fully release resources when handling malformed or duplicate CONNECT packets. When clients send invalid CONNECT packets - either due to repeated attempts or failed authentication - the server may silently drop the connection or send a CONNACK but fail to close the session or deallocate internal resources. This behavior allows an attacker to create numerous half-open connections that consume memory and file descriptors indefinitely, potentially triggering the Linux OOM killer and causing a denial of service.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-11-01)
CWE: CWE-400
Published: 2026-08-07
Modified: 2026-09-29
Record from: the NVD, synced 2026-10-19

References

https://github.com/codepr/sol/issues/12
https://github.com/peter-pe/sol-vulnerabilities/blob/main/CVE-2025-63235.md
https://github.com/codepr/sol/issues/12
https://github.com/peter-pe/sol-vulnerabilities/blob/main/CVE-2025-63235.md

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