CVE-2022-4991 Tychon is vulnerable to privilege escalation due to OPENSSLDIR location
An attacker can achieve arbitrary code execution with SYSTEM privileges by placing a malicious configuration file in a user-controllable OpenSSL directory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-4991?
CVE-2022-4991 is a high-severity vulnerability in Tychon, published on 1 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Tychon includes an OpenSSL component that specifies an OPENSSLDIR variable as a subdirectory that may be controllable by an unprivileged user on Windows. Tychon contains a privileged service that uses this OpenSSL component. A user who can place a specially-crafted openssl.cnf file at an appropriate path may be able to achieve arbitrary code execution with SYSTEM privileges.
Which versions are affected by CVE-2022-4991?
How do I fix CVE-2022-4991?
No fix has been published for CVE-2022-4991 yet. Limit exposure of the affected software until one is available.
Is CVE-2022-4991 being exploited?
There is no known exploitation of CVE-2022-4991 in the wild and no public exploit code.
Sources
Also known as GHSA-5f9c-98g5-38r4.