Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2023-36563

Microsoft WordPad Information Disclosure Vulnerability

Microsoft / Windows 10 Version 1809 · affected before 10.0.17763.4974

Watch CVE-2023-36563 Browse KEV feed
Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
20.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-36563 is an unauthenticated Microsoft WordPad Information Disclosure Vulnerability.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Confidence is confirmed.

Who is affected?

Affected products include Microsoft / Windows 10 Version 1809 and 20 other products, including affected before 10.0.17763.4974, affected before 10.0.17763.4974, and affected before 10.0.20348.2031.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Microsoft WordPad Information Disclosure Vulnerability

Microsoft WordPad Information Disclosure Vulnerability

Microsoft Affected
Windows 10 Version 1809
Before 10.0.17763.4974
Microsoft Affected
Windows Server 2019
Before 10.0.17763.4974
Microsoft Affected
Windows Server 2019 (Server Core installation)
Before 10.0.17763.4974
Microsoft Affected
Windows Server 2022
Before 10.0.20348.2031
Microsoft Affected
Windows 11 version 21H2
Before 10.0.22000.2538
Microsoft Affected
Windows 10 Version 21H2
Before 10.0.19041.3570
Microsoft Affected
Windows 11 version 22H2
Before 10.0.22621.2428
Microsoft Affected
Windows 10 Version 22H2
Before 10.0.19045.3570
Microsoft Affected
Windows 10 Version 1507
Before 10.0.10240.20232
Microsoft Affected
Windows 10 Version 1607
Before 10.0.14393.6351
Microsoft Affected
Windows Server 2016
Before 10.0.14393.6351
Microsoft Affected
Windows Server 2016 (Server Core installation)
Before 10.0.14393.6351
Microsoft Affected
Windows Server 2008 Service Pack 2
Before 6.0.6003.22317
Microsoft Affected
Windows Server 2008 Service Pack 2 (Server Core installation)
Before 6.0.6003.22317
Microsoft Affected
Windows Server 2008 Service Pack 2
Before 6.0.6003.22317
Microsoft Affected
Windows Server 2008 R2 Service Pack 1
Before 6.1.7601.26769
Microsoft Affected
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Before 6.1.7601.26769
Microsoft Affected
Windows Server 2012
Before 6.2.9200.24523
Microsoft Affected
Windows Server 2012 (Server Core installation)
Before 6.2.9200.24523
Microsoft Affected
Windows Server 2012 R2
Before 6.3.9600.21620
Microsoft Affected
Windows Server 2012 R2 (Server Core installation)
Before 6.3.9600.21620
View vendor advisory (opens in new tab)
Published
10 Oct 2023
Exploitation Attempts Reported
10 Oct 2023
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
Required

Tags

windows cisa nessus_scanner microsoft

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CISA

Recorded 10 Oct 2023

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2023-10-10 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nessus https://www.tenable.com/plugins/nessus/182865 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.5 Medium

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C

EPSS

20.3%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Input Validation CWE-20

Timeline

From disclosure to observed exploitation attempts

  1. 09:26 UTC

    Nessus plugin available

    Scanner coverage available

  2. 17:08 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  4. 20:11 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2023-36563

Sample API response 
{
  "cve_id": "CVE-2023-36563",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": 0.20318,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}