CVE-2021-1730: microsoft exchange_server
Vulnerability summary
CVE-2021-1730 is a medium (CVSS 5.8) vulnerability in microsoft exchange_server. EPSS estimates a 1.82% chance of exploitation in the next 30 days, higher than 78.4% of scored vulnerabilities.
Timeline
- 25-02-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
<p>A spoofing vulnerability exists in Microsoft Exchange Server which could result in an attack that would allow a malicious actor to impersonate the user.</p> <p>This update addresses this vulnerability.</p> <p>To prevent these types of attacks, Microsoft recommends customers to download inline images from different DNSdomains than the rest of OWA. Please see further instructions in the FAQ to put in place this mitigations.</p>
CVSS metrics
3 scores · 2 sources · 2 versions- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS trend
Probability
1.82%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.82% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Microsoft3 products
- exchange_server2016:cumulative_update_18 | 2019:cumulative_update_7
- microsoft exchange server 2016 cumulative update 18≥ 15.01.0, < publication
- microsoft exchange server 2019 cumulative update 7≥ 15.02.0, < publication
1 vendor · 3 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1730X Refsource MISCPatchVendor Advisory