# CVE-2019-6453: Command injection in n/a

> Remote attackers can execute arbitrary commands via argument injection in mIRC URI handlers, requiring user interaction with a malicious link.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Feb 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-95vj-g5cr-7j53

## What is CVE-2019-6453?

CVE-2019-6453 is a high-severity command injection vulnerability in n/a, published on 18 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

mIRC before 7.55 allows remote command execution by using argument injection through custom URI protocol handlers. The attacker can specify an irc:// URI that loads an arbitrary .ini file from a UNC share pathname. Exploitation depends on browser-specific URI handling (Chrome is not exploitable).

Weakness: CWE-88 (Improper Neutralization of Argument Delimiters in a Command)

## Which versions are affected by CVE-2019-6453?

It affects 1 product.


Products: Mirc Mirc.

## How do I fix CVE-2019-6453?

No fix has been published for CVE-2019-6453 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-6453 being exploited?

There is no known exploitation of CVE-2019-6453 in the wild and no public exploit code.

Public exploit code:

- Proof of calc for CVE-2019-6453 (github_poc): https://github.com/proofofcalc/cve-2019-6453-poc
- Proof of calc for CVE-2019-6453 (github_poc): https://github.com/andripwn/mIRC-CVE-2019-6453
- mIRC < 7.55 - 'Custom URI Protocol Handlers' Remote Command Execution (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2008-4449](https://insights.sbomify.com/CVE-2008-4449/): Memory corruption in n/a (critical 9.3)
- [CVE-2003-1336](https://insights.sbomify.com/CVE-2003-1336/): Memory corruption in n/a (critical 9.3)
- [CVE-2008-7314](https://insights.sbomify.com/CVE-2008-7314/): Denial of service in mIRC (high 7.5)
- [CVE-2007-4402](https://insights.sbomify.com/CVE-2007-4402/): Command injection in n/a (medium 6.8)
- [CVE-2011-5282](https://insights.sbomify.com/CVE-2011-5282/): Information disclosure in mIRC (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-6453 and fix it if it is affected.

What it is: CVE-2019-6453 is a high-severity command injection vulnerability in n/a, published on 18 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-6453 in the wild and no public exploit code.

Affected product: n/a. 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-2019-6453/ (Markdown: https://insights.sbomify.com/CVE-2019-6453/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-6453
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-6453
- OSV: https://osv.dev/vulnerability/CVE-2019-6453

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-6453/
Summaries are generated and may contain mistakes; the official description above is the record.