CVE-2025-53799: microsoft 365_copilot Use of Uninitialized Resource
CVSS: 5.5v3.1MediumAnalyzed
Published 09-09-2025Last modified 20-02-2026
Vulnerability summary
CVE-2025-53799 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in microsoft 365_copilot. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 55% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.78%
0%100%
Low · -0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 09-09-2025PublishedVulnerability first disclosed.
- 20-02-2026Last modifiedVulnerability information updated.
Description
Use of uninitialized resource in Windows Imaging Component allows an unauthorized attacker to disclose information locally.
CVSS metrics
2 scores · 2 sources · 1 versionMedium 5.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.78%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
-0.01 pp
From 0.78% on 19-09-2026
19-09-202619-10-2026
EPSS score0.78%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft37 products
- 365_copilot< 16.0.19220.20000
- microsoft office for android≥ 16.0.1, < 16.0.19220.20000
- windows_10_1507< 10.0.10240.21128
- windows_10_1607< 10.0.14393.8422
- windows_10_1809< 10.0.17763.7792
1 vendor · 37 products
