CVE-2026-45498
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
4.0
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS — probability of exploitation (30 days)
63.1%
99.2th percentile
CISA KEV
Listed
Added 2026-05-20 · patch by 2026-06-03
Weakness / dates
CWE-400
Published 2026-05-20 · modified 2026-07-23
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | N | None |
| Availability | L | Low |
Timeline
- 2026-05-20 — Published (NVD)
- 2026-05-20 — Added to CISA KEV (actively exploited)
- 2026-06-03 — CISA patch-by deadline
- 2026-07-23 — Last modified (NVD)
Description
Microsoft Defender Denial of Service Vulnerability