CVE-2021-36809

CVE-2021-36809 is a medium-severity vulnerability in Sophos Ssl Vpn Client with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

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.

Frequently asked questions

What is CVE-2021-36809?
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.
How severe is CVE-2021-36809?
CVE-2021-36809 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability high.
Is CVE-2021-36809 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-36809?
CVE-2021-36809 affects Sophos Ssl Vpn Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-36809?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-36809 published?
CVE-2021-36809 was published on 2022-03-08 and last updated on 2026-06-17.

References

Affected products (1)