# CVE-2019-3972: Denial of service in Comodo Antivirus

> A low-privileged attacker can crash Comodo Antivirus by modifying a shared memory object, causing a denial of service.

- **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-r5cr-x7vg-hh88

## What is CVE-2019-3972?

CVE-2019-3972 is a medium-severity denial of service 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 12.0.0.6810 and below are vulnerable to Denial of Service affecting CmdAgent.exe via an unprotected section object "<GUID>_CisSharedMemBuff". This section object is exposed by CmdAgent and contains a SharedMemoryDictionary object, which allows a low privileged process to modify the object data causing CmdAgent.exe to crash.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2019-3972?

It affects 1 product.


Products: Comodo Antivirus.

## How do I fix CVE-2019-3972?

No fix has been published for CVE-2019-3972 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-3972 being exploited?

There is no known exploitation of CVE-2019-3972 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-2019-3971](https://insights.sbomify.com/CVE-2019-3971/): Null dereference in Comodo Antivirus (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-3972 and fix it if it is affected.

What it is: CVE-2019-3972 is a medium-severity denial of service 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-2019-3972 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-2019-3972/ (Markdown: https://insights.sbomify.com/CVE-2019-3972/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-3972
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-3972
- OSV: https://osv.dev/vulnerability/CVE-2019-3972

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-3972/
Summaries are generated and may contain mistakes; the official description above is the record.