CVE-2020-1025: microsoft lync Improper Input Validation
Vulnerability summary
CVE-2020-1025 is a critical (CVSS 9.8) Improper Input Validation vulnerability in microsoft lync. EPSS estimates a 5.85% chance of exploitation in the next 30 days, higher than 93.1% of scored vulnerabilities.
Timeline
- 14-07-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
5.85%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
0.00 pp
From 5.85% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft11 products
- lync2013
- microsoft lync server 2013< publication
- microsoft sharepoint enterprise server 2016≥ 16.0.0, < publication
- microsoft sharepoint foundation 2013 service pack 1≥ 15.0.0, < publication
- microsoft sharepoint server 2019≥ 16.0.0, < publication
1 vendor · 11 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1025X Refsource MISCPatchVendor Advisory