What’s Vulnerable › Vulnerabilities

CVE-2019-3973

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-07-17 · updated 2026-06-17
• Weakness: CWE-787

Description

Comodo Antivirus versions 11.0.0.6582 and below are vulnerable to Denial of Service affecting CmdGuard.sys via its filter port "cmdServicePort". A low privileged process can crash CmdVirth.exe to decrease the port's connection count followed by process hollowing a CmdVirth.exe instance with malicious code to obtain a handle to "cmdServicePort". Once this occurs, a specially crafted message can be sent to "cmdServicePort" using "FilterSendMessage" API. This can trigger an out-of-bounds write if lpOutBuffer parameter in FilterSendMessage API is near the end of specified buffer bounds. The crash occurs when the driver performs a memset operation which uses a size beyond the size of buffer specified, causing kernel crash.

Affected products

• Comodo Antivirus: through 11.0.0.6582

References

• https://www.tenable.com/security/research/tra-2019-34
• https://www.tenable.com/security/research/tra-2019-34

Get alerted when CVE-2019-3973 or the next vulnerability affects your stack