Cyber Resilience

CVE-2025-3864

Low

Published: 28 May 2025

Published
28 May 2025
Modified
15 April 2026
KEV Added
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Patch
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CVSS Score v4 2.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0030 53.8th percentile
Risk Priority 5 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-3864 is a low-severity Missing Release of Resource after Effective Lifetime (CWE-772) vulnerability in Cert (inferred from references). Its CVSS base score is 2.3 (Low).

Operationally, ranked in the top 46.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Hackney fails to properly release HTTP connections to the pool after handling 307 Temporary Redirect responses. Remote attackers can exploit this to exhaust connection pools, causing denial of service in applications using the library. Fix for this issue has been…

more

included in 1.24.0 release.

CWE(s)
CWE-772

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

Cert
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-10 Network Disconnect
addresses: CWE-772

Ensures network resources are released once the session ends or becomes inactive, closing the window for missing-release weaknesses.

References