CVE-2021-42320: microsoft microsoft sharepoint enterprise server 2016 Authentication Bypass by Spoofing
CVSS: 8.0v3.1HighModified
Published 15-12-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-42320 is a high (CVSS 8.0) Authentication Bypass by Spoofing vulnerability in microsoft microsoft sharepoint enterprise server 2016. EPSS estimates a 1.60% chance of exploitation in the next 30 days, higher than 75.4% of scored vulnerabilities.
CVSS score
8.0/10
010
High · v3.1 (CVE.org)EPSS score
1.60%
0%100%
Low · +0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 15-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Microsoft SharePoint Server Spoofing Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 8.0Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSources2 sources · 5.7–8.0
- NVDNIST5.7MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:NDiffers
Low 3.5Preferred score · NVD (NIST)
AV:N/AC:M/Au:S/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.60%
Chance of exploitation in the next 30 days
Percentile
75%
Versus all other CVEs
30-day change
+0.09 pp
From 1.52% on 19-09-2026
19-09-202619-10-2026
EPSS score1.60%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft5 products
- microsoft sharepoint enterprise server 2016≥ 16.0.0, < 16.0.5254.1000
- microsoft sharepoint server 2019≥ 16.0.0, < 16.0.10381.20001
- microsoft sharepoint server subscription edition≥ 16.0.0, < 16.0.14326.20620
- sharepoint_enterprise_server2016
- sharepoint_serverna | 2019
1 vendor · 5 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-42320X Refsource MISCPatchVendor Advisory