CVE-2026-103577CWE-453

CVE-2026-103577

High · published October 13, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
43.2
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00518 · 43.2th percentile
Weakness
CWE-453 · Insecure Default Variable Initialization
Published
2026-10-13T23:17Z
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-103577 · [email protected]
EPSS history
Timeline
  • 15 OCT 03:28Z
    EPSS moved — → 1%
    epss
  • 13 OCT 19:01Z
    Microsoft QUIC Security Feature Bypass Vulnerability
    cvelistv5
  • 13 OCT 19:01Z
    Microsoft QUIC Security Feature Bypass Vulnerability
    cvelistv5