# CVE-2022-21147: Memory corruption in Alyac

> An out-of-bounds read in ESTsoft Alyac allows attackers to cause denial of service via a crafted PE file.

- **Severity:** Medium 5.0 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 May 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-6r55-j877-x6cq

## What is CVE-2022-21147?

CVE-2022-21147 is a medium-severity memory corruption vulnerability in ESTsoft Alyac, published on 12 May 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An out of bounds read vulnerability exists in the malware scan functionality of ESTsoft Alyac 2.5.7.7. A specially-crafted PE file can trigger this vulnerability to cause denial of service and termination of malware scan. An attacker can provide a malicious file to trigger this vulnerability.

Weakness: CWE-125 (Out-of-bounds Read), CWE-823 (Use of Out-of-range Pointer Offset)

## Which versions are affected by CVE-2022-21147?

It affects 1 product.


Products: Estsoft Alyac.

## How do I fix CVE-2022-21147?

No fix has been published for CVE-2022-21147 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-21147 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-21147 exists.

## Other vulnerabilities in ESTsoft Alyac

- [CVE-2022-29886](https://insights.sbomify.com/CVE-2022-29886/): Integer overflow in Alyac (high 7.3)
- [CVE-2022-32543](https://insights.sbomify.com/CVE-2022-32543/): Integer overflow in Alyac (high 7.3)
- [CVE-2022-43665](https://insights.sbomify.com/CVE-2022-43665/): Denial of service in Alyac (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-21147 and fix it if it is affected.

What it is: CVE-2022-21147 is a medium-severity memory corruption vulnerability in ESTsoft Alyac, published on 12 May 2022. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-21147 exists.

Affected product: ESTsoft Alyac. 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-2022-21147/ (Markdown: https://insights.sbomify.com/CVE-2022-21147/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-21147
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-21147
- OSV: https://osv.dev/vulnerability/CVE-2022-21147

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-21147/
Summaries are generated and may contain mistakes; the official description above is the record.