# CVE-2021-26624: eScan Anti-Virus Local privilege escalation Vulnerability

> Local attackers can escalate privileges to root by manipulating parameters in the eScan Anti-Virus runasroot command due to insufficient validation.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 1 Apr 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7jxx-pm65-7mq4

## What is CVE-2021-26624?

CVE-2021-26624 is a high-severity vulnerability in MicroWorld Technologies Inc. eScan Anti-Virus for Linux, published on 1 Apr 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An local privilege escalation vulnerability due to a "runasroot" command in eScan Anti-Virus. This vulnerability is due to invalid arguments and insufficient execution conditions related to "runasroot" command. This vulnerability can induce remote attackers to exploit root privileges by manipulating parameter values.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-26624?

It affects 1 product.


Products: Escanav Escan Anti-Virus.

## How do I fix CVE-2021-26624?

No fix has been published for CVE-2021-26624 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-26624 being exploited?

There is no known exploitation of CVE-2021-26624 in the wild and no public exploit code.

## Other vulnerabilities in MicroWorld Technologies Inc. eScan Anti-Virus for Linux

- [CVE-2018-18388](https://insights.sbomify.com/CVE-2018-18388/): Command injection in n/a (critical 9.8)
- [CVE-2025-0798](https://insights.sbomify.com/CVE-2025-0798/): MicroWorld eScan Antivirus Quarantine rtscanner os command injection (critical 9.2)
- [CVE-2023-4383](https://insights.sbomify.com/CVE-2023-4383/): MicroWorld eScan Anti-Virus runasroot incorrect execution-assigned permissions (high 7.8)
- [CVE-2023-2875](https://insights.sbomify.com/CVE-2023-2875/): eScan Antivirus IoControlCode PROCOBSRVESX.SYS 0x22E008u null pointer dereference (medium 5.5)
- [CVE-2025-1366](https://insights.sbomify.com/CVE-2025-1366/): MicroWord eScan Antivirus VirusPopUp strcpy stack-based overflow (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-26624 and fix it if it is affected.

What it is: CVE-2021-26624 is a high-severity vulnerability in MicroWorld Technologies Inc. eScan Anti-Virus for Linux, published on 1 Apr 2022. 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-2021-26624 in the wild and no public exploit code.

Affected product: MicroWorld Technologies Inc. eScan Anti-Virus for Linux. 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-2021-26624/ (Markdown: https://insights.sbomify.com/CVE-2021-26624/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-26624
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-26624
- OSV: https://osv.dev/vulnerability/CVE-2021-26624

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-26624/
Summaries are generated and may contain mistakes; the official description above is the record.