Cyber Resilience

CVE-2021-4070

CriticalPublic PoC

Published: 23 February 2022

Published
23 February 2022
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS Score 0.0023 45.6th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-4070 is a critical-severity Off-by-one Error (CWE-193) vulnerability in V2Fly V2Ray-Core. Its CVSS base score is 9.1 (Critical).

Operationally, ranked at the 45.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

Off-by-one Error in GitHub repository v2fly/v2ray-core prior to 4.44.0.

CWE(s)
CWE-193

Related Threats

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

Affected Assets

v2fly
v2ray-core
≤ 4.44.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References