Endpoint and Intercept X
CVE-2021-36809: A local attacker can overwrite arbitrary files on the system with VPN client logs using administrator privi…
A local attacker can overwrite arbitrary files on the system with VPN client logs using administrator privileges, potentially resulting in a denial of service and data loss, in all versions of Sophos SSL VPN client.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 6.1
EPSS0.23%Chance of exploitation in 30 days
Public exploitNot tracked
FixSee advisory
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| SSL VPN client unspecified to 2.3.8.0 | Upgrade past 2.3.8.0; see the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A local attacker can overwrite arbitrary files on the system with VPN client logs using administrator privileges, potentially resulting in a denial of service and data loss, in all versions of Sophos SSL VPN client.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.