CVE-2026-103577

high

Description

Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103577

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100390

Details

Source: Mitre, NVD

Published: 2026-10-13

Updated: 2026-10-13

Risk Information

CVSS v2

Base Score: 6.1

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 7.5

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

Severity: High

EPSS

EPSS: 0.00518