# CVE-2019-3971: Null dereference in Comodo Antivirus

> A local attacker can cause a denial of service in Comodo Antivirus by triggering a null pointer dereference in the virtualization component.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jul 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v3cp-w37g-979x

## What is CVE-2019-3971?

CVE-2019-3971 is a medium-severity vulnerability in Comodo Antivirus, published on 17 Jul 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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.

## Which versions are affected by CVE-2019-3971?

It affects 1 product.


Products: Comodo Antivirus.

## How do I fix CVE-2019-3971?

No fix has been published for CVE-2019-3971 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3971 being exploited?

There is no known exploitation of CVE-2019-3971 in the wild and no public exploit code.

## Other vulnerabilities in Comodo Antivirus

- [CVE-2022-34008](https://insights.sbomify.com/CVE-2022-34008/): Privilege escalation in n/a (high 7.8)
- [CVE-2019-3969](https://insights.sbomify.com/CVE-2019-3969/): Privilege escalation in Comodo Antivirus (high 7.8)
- [CVE-2019-14270](https://insights.sbomify.com/CVE-2019-14270/): Privilege escalation in n/a (high 7.1)
- [CVE-2019-3970](https://insights.sbomify.com/CVE-2019-3970/): Missing authorization in Comodo Antivirus (medium 5.5)
- [CVE-2019-3972](https://insights.sbomify.com/CVE-2019-3972/): Denial of service in Comodo Antivirus (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3971 and fix it if it is affected.

What it is: CVE-2019-3971 is a medium-severity vulnerability in Comodo Antivirus, published on 17 Jul 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-3971 in the wild and no public exploit code.

Affected product: Comodo Antivirus. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-3971/ (Markdown: https://insights.sbomify.com/CVE-2019-3971/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3971
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3971
- OSV: https://osv.dev/vulnerability/CVE-2019-3971

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3971/
Summaries are generated and may contain mistakes; the official description above is the record.