Security Resilience

CVE-2023-36563

Microsoft Windows 10 1809 ≤ 10.0.17763.4974

CISA KEVActive ExploitationEUVD Exploited
Published
10 October 2023
Modified
28 October 2025
KEV Added
10 October 2023
Patch / advisory
CVSS Score v3.1 6.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS Score 0.20 97th percentile
Risk Priority 76 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-2023-36563 is a medium-severity Improper Input Validation (CWE-20) vulnerability in Microsoft Windows 10 1809. Its CVSS base score is 6.5 (Medium).

Operationally, ranked in the top 3% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

CVE-2023-36563 is an information disclosure vulnerability affecting Microsoft WordPad. It carries a CVSS 3.1 base score of 6.5 reflecting a network attack vector, low attack complexity, no required privileges, and required user interaction, resulting in high impact to confidentiality while leaving integrity and availability unaffected. The issue is also associated with CWE-20.

An unauthenticated remote attacker can exploit the flaw by supplying a specially crafted file or document that a user opens in WordPad, enabling disclosure of sensitive information from the target system.

Microsoft has issued remediation guidance through its Security Response Center update guide. The vulnerability is listed in CISA’s catalog of known exploited vulnerabilities, confirming observed real-world exploitation activity.

The associated EPSS score has remained flat at 0.0283 from disclosure through the present measurement.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

Microsoft WordPad Information Disclosure Vulnerability

CWE(s)
KEV Date Added
10 October 2023

Related Threats

CVEs Like This One

CVE-2024-30040Same product: Microsoft Windows 10 1507both on KEV
CVE-2025-32706Same product: Microsoft Windows 10 1507both on KEV
CVE-2023-35367Same product: Microsoft Windows 10 1507
CVE-2023-32057Same product: Microsoft Windows 10 1507
CVE-2023-35377Same product: Microsoft Windows 10 1507
CVE-2023-35349Same product: Microsoft Windows 10 1507
CVE-2023-36731Same product: Microsoft Windows 10 1507
CVE-2023-29359Same product: Microsoft Windows 10 1507
CVE-2023-29371Same product: Microsoft Windows 10 1507
CVE-2023-35303Same product: Microsoft Windows 10 1507

Affected Assets

microsoft
windows 10 1507
≤ 10.0.10240.20232
microsoft
windows 10 1607
≤ 10.0.14393.6351 · ≤ 10.0.14393.6351
microsoft
windows 10 1809
≤ 10.0.17763.4974 · ≤ 10.0.17763.4974 · ≤ 10.0.17763.4974
microsoft
windows 10 21h2
≤ 10.0.19041.3570
microsoft
windows 10 22h2
≤ 10.0.19045.3570
microsoft
windows 11 21h2
≤ 10.0.22000.2538
microsoft
windows 11 22h2
≤ 10.0.22621.2428
microsoft
windows server 2008
all versions, r2
microsoft
windows server 2012
all versions, r2
microsoft
windows server 2016
≤ 10.0.14393.6351
+2 more product configuration(s) — see NVD for full list

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-20

Security testing and developer training directly verify and enforce proper input validation, reducing exploitability of injection and malformed-data weaknesses.

addresses: CWE-20

Security testing and evaluation at multiple SDLC stages directly detects missing or flawed input validation, with the required remediation process ensuring fixes are applied.

addresses: CWE-20

Directly implements checks on information inputs to reject invalid data before processing.

addresses: CWE-20

Spam protection mechanisms perform filtering and detection on inbound/outbound messages, directly compensating for missing or weak input validation of unsolicited content.

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.

blocks

A.8.25 mandates security requirements, secure coding guidelines, checkpoints, testing (incl. code scans) and developer training in the SDLC, which reaches a slice of input validation defects but leaves the majority (incomplete enforcement, second-order inputs, parser differentials, post-validation canonicalization) unaddressed as in the SA-3 and A.8.28 anchors.

blocks

Mandating input controls that include integrity checks and input validation ensures that untrusted data is examined before use, blocking the root cause of many injection and malformed-data weaknesses.

blocks

Security-by-design principles explicitly call for data validation and sanitization at every layer, reducing the chance that malformed or malicious input will be processed without scrutiny.

prevents

Requiring language-specific secure coding standards, peer review, SAST and documented mitigation of common programming errors forces validation of all inputs before they are trusted.

finds

Testing against a defined set of requirements and using code review plus vulnerability scanning forces validation of inputs and handling of unanticipated conditions, reducing the chance that malformed data will be accepted.

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-20, a class-level weakness, and none of its children carries one either.

References