01 Record
CVE-2021-1730
Microsoft Exchange Server Spoofing Vulnerability
MediumPUBLISHEDCNA: microsoft
CNA base score5.4 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
02 Description
Microsoft Exchange Server Spoofing Vulnerability
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 1.81% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 78.3% of scored records. A rank, not a probability.
- NVD base score
- 5.4 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-02-25 23:01Z5 YR AGO
- Last updated
- 2024-08-03 16:18Z2 YR AGO
- Reserved
- 2020-12-02
- Assigning CNA
- microsoft
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.4)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
- Weaknesses
- No CWE assigned
- Data version
- 5.1
- Document digest
- 5bab963eaca29ea1e2ff9c2e55d42d7295e9249367e8179782c3840bf8147f7c
05 Affected products
VendorProductVersionsPlatforms
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 715.02.0 to < publicationx64-based Systems
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 1815.01.0 to < publicationx64-based Systems
06 References
- portal.msrc.microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1730