What is CVE-2019-3971?

CVE-2019-3971 is a medium-severity vulnerability in Comodo Antivirus. CVSS score: 5.5/10. Published 2019-07-17.

How severe is CVE-2019-3971?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Comodo Antivirus

CVE-2019-3971

Comodo Antivirus versions up to 12.0.0.6810 are vulnerable to a local Denial of Service affecting CmdVirth.exe via its LPC port "cmdvrtLPCServerPort". A low privileged local process can connect to this port and send an LPC_DATAGRAM, which triggers an Access Violation due to hardcoded NULLs used for Source parameter in a memcpy operation that is called for this handler. This results in CmdVirth.exe and its child svchost.exe instances to terminate.

Published 2019-07-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Comodo Antivirus
Comodo Antivirus — versions Versions 12.0.0.6810 and below

References

www.tenable.com/security/research/tra-2019-34 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3971?: CVE-2019-3971 is a medium-severity vulnerability in Comodo Antivirus. CVSS score: 5.5/10. Published 2019-07-17.
How severe is CVE-2019-3971?: Medium severity. CVSS v3 base score is 5.5 out of 10.