| Package | Affected versions | Patched versions |
|---|---|---|
| personal firewall | = 4.2 | |
| serverfirewall | = 1.1.1 |
The FWDRV driver in Kerio Personal Firewall 4.2 and Server Firewall 1.1.1 allows local users to cause a denial of service (crash) by setting the PAGE_NOACCESS or PAGE_GUARD protection on the Page Environment Block (PEB), which triggers an exception, aka the "PEB lockout vulnerability."
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