CVE-2023-21550

MEDIUM

Windows Cryptographic Information Disclosure Vulnerability

Affects 10 products across 1 vendor.

CVSS 3.15.5
EPSS0.6%
Percentile46th
PatchPatched
CVSS Vector — Plain English Requires local access, low complexity, low privileges required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, no integrity impact, no availability impact.
CWE Weakness Definitions
CWE-20: Improper Input Validation

Software does not validate or incorrectly validates input, allowing attackers to craft data processed in unintended ways.

Related Attack Patterns (CAPEC)
CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
via CWE-20
CAPEC-7 Blind SQL Injection
via CWE-20
CAPEC-8 Buffer Overflow in an API Call
via CWE-20
CAPEC-9 Buffer Overflow in Local Command-Line Utilities
via CWE-20
CAPEC-10 Buffer Overflow via Environment Variables
via CWE-20
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Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.

◆ AI Analysis — automated analysis, not human-reviewed

A vulnerability in the Windows cryptographic library could allow an attacker to retrieve sensitive cryptographic information, potentially compromising the security of encrypted data.

BSID: BS-2023-GLOBAL-327928-M • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2023-21550?
A vulnerability in the Windows cryptographic library could allow an attacker to retrieve sensitive cryptographic information, potentially compromising the security of encrypted data.
What is the CVSS score for CVE-2023-21550?
CVE-2023-21550 has CVSS 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS: 0.6%.
Is CVE-2023-21550 actively exploited?
No confirmed active exploitation of CVE-2023-21550 as of 2026-05-30.
How do I remediate CVE-2023-21550?
Priority: MEDIUM. Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21550
What systems are affected by CVE-2023-21550?
CVE-2023-21550 affects Microsoft Windows 10 1809, Windows 10 20H2, Windows 10 21H2, Windows 10 22H2, Windows 11 21H2, Windows 11 22H2, Windows Server 2019, Windows Server 2022, Windows Server 2019 (Server Core installation), Windows Server 2022 (Server Core installation).
Vulnerability Details
CVE IDCVE-2023-21550
BSIDBS-2023-GLOBAL-327928-M BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Published2023-01-10
Last Modified2024-11-21
ICS Relevance0%
Weakness (CWE)
Improper Input Validation
SourceNVD
Official Description

Windows Cryptographic Information Disclosure Vulnerability

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is due to improper handling of cryptographic operations in the Windows cryptographic library. An attacker with local access could exploit this vulnerability to retrieve cryptographic keys or other sensitive information from the system.

Exploitation Likelihood: MEDIUM

Affected Products
VendorProductAffected Versions
Microsoft Windows 10 1809 No version listed by source
Microsoft Windows 10 20H2 No version listed by source
Microsoft Windows 10 21H2 No version listed by source
Microsoft Windows 10 22H2 No version listed by source
Microsoft Windows 11 21H2 No version listed by source
Microsoft Windows 11 22H2 No version listed by source
Microsoft Windows Server 2019 No version listed by source
Microsoft Windows Server 2022 No version listed by source
Microsoft Windows Server 2019 (Server Core installation) No version listed by source
Microsoft Windows Server 2022 (Server Core installation) No version listed by source
Remediation
View Vendor Advisory →

Remediation Priority: MEDIUM

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 1374 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash3c854102e5a518a06308c3f96b805c4b6347963afc54dab3785f09b3294ec1b26130977782ecf7aa608ddcd8db6111afec2b85c4f22782160ae34157b929f2f5
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