VulnerabilityAnalyzed
CVE-2025-21355
Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network
CRITICAL 9.8EPSS 1.66%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.66%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.66% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-306
- Affected
- microsoft/bing
- Source
- secure@microsoft.com
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21355Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.