CVE-2025-21276: microsoft windows_10_1507 Integer Underflow (Wrap or Wraparound)
CVSS: 7.5v3.1HighAnalyzed
Published 14-01-2025Last modified 09-06-2026
Vulnerability summary
CVE-2025-21276 is a high (CVSS 7.5) Integer Underflow (Wrap or Wraparound) vulnerability in microsoft windows_10_1507. EPSS estimates a 2.46% chance of exploitation in the next 30 days, higher than 84.2% of scored vulnerabilities.
CVSS score
7.5/10
010
High · v3.1 (CVE.org)EPSS score
2.46%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 14-01-2025PublishedVulnerability first disclosed.
- 09-06-2026Last modifiedVulnerability information updated.
Description
Windows MapUrlToZone Denial of Service Vulnerability
CVSS metrics
2 scores · 2 sources · 1 versionHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.46%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
+0.03 pp
From 2.42% on 21-09-2026
21-09-202621-10-2026
EPSS score2.46%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-191Integer Underflow (Wrap or Wraparound)The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
- CWE-693Protection Mechanism FailureThe product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.
Affected systems
Microsoft35 products
- windows_10_1507< 10.0.10240.20890
- windows_10_1607< 10.0.14393.7699
- windows_10_1809< 10.0.17763.6775
- windows_10_21h2< 10.0.19044.5371
- windows_10_22h2< 10.0.19045.5371
1 vendor · 35 products
