Security Resilience

CVE-2026-103577

Published
13 October 2026
Modified
13 October 2026
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H
EPSS Score 0.0052 43th percentile
Risk Priority 54 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-103577 is a high-severity Insecure Default Variable Initialization (CWE-453) vulnerability. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Data Obfuscation (T1001); ranked at the 43th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to CM-2 (Baseline Configuration) and CM-6 (Configuration Settings) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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

CWE(s)
CWE-453

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001 Data Obfuscation Command And Control
Adversaries may obfuscate command and control traffic to make it more difficult to detect.
attack.mitre.org →
T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1003.007 Proc Filesystem Credential Access
Adversaries may gather credentials from the proc filesystem or `/proc`.
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-0082Shared CWE-453
CVE-2026-92950Shared CWE-453
CVE-2026-41330Shared CWE-453
CVE-2024-21411Shared CWE-453
CVE-2024-41255Shared CWE-453
CVE-2024-39916Shared CWE-453
CVE-2025-61926Shared CWE-453
CVE-2024-49120Shared CWE-453
CVE-2023-27516Shared CWE-453
CVE-2025-47945Shared CWE-453

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 4 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

CM-2 Baseline Configuration partial match

Requires maintaining a documented baseline configuration that can enforce secure initial values instead of insecure defaults.

CM-6 Configuration Settings partial match

Requires establishing the most restrictive configuration settings, which directly overrides or prevents use of insecure default variable initializations.

SA-8 Security and Privacy Engineering Principles partial match

Mandates application of security engineering principles during development that include use of secure defaults and proper variable initialization.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-01 partial match
blocks

Hardened baselines and configuration management directly replace insecure product defaults with secure values.

PR.PS-06 partial match
blocks

Secure software development practices explicitly include choosing safe initial values instead of insecure defaults.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.19 Installation of software on operational systems partial match
removes
A.8.20 Networks security partial match
removes
A.8.25 Secure development life cycle partial match
blocks

Secure development life cycle requires explicit secure initialization of variables.

A.8.26 Application security requirements partial match
removes
A.8.27 Secure system architecture and engineering principles partial match
blocks

Secure architecture principles include avoiding insecure defaults in design.

A.8.28 Secure coding partial match
prevents

Secure coding standards mandate explicit, safe variable initialization.

References