# CVE-2018-4841: Auth bypass in TIM 1531 IRC

> Remote attackers can bypass authentication to perform administrative operations, read/modify data, or cause denial-of-service on Siemens TIM 1531 IRC devices.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/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:** 29 Mar 2018
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-vj79-837c-gmf4

## What is CVE-2018-4841?

CVE-2018-4841 is a critical authentication bypass vulnerability in Siemens AG TIM 1531 IRC, published on 29 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been identified in TIM 1531 IRC (All versions < V1.1). A remote attacker with network access to port 80/tcp or port 443/tcp could perform administrative operations on the device without prior authentication. Successful exploitation could allow to cause a denial-of-service, or read and manipulate data as well as configuration settings of the affected device. At the stage of publishing this security advisory no public exploitation is known. Siemens provides mitigations to resolve it.

Weakness: CWE-287 (Improper Authentication), CWE-303 (Incorrect Implementation of Authentication Algorithm)

## Which versions are affected by CVE-2018-4841?

It affects 1 product.


Products: Siemens Tim 1531 Irc Firmware.

## How do I fix CVE-2018-4841?

No fix has been published for CVE-2018-4841 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-4841 being exploited?

There is no known exploitation of CVE-2018-4841 in the wild and no public exploit code.

## Other vulnerabilities in Siemens AG TIM 1531 IRC

- [CVE-2018-13816](https://insights.sbomify.com/CVE-2018-13816/): Auth bypass in TIM 1531 IRC (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4841 and fix it if it is affected.

What it is: CVE-2018-4841 is a critical authentication bypass vulnerability in Siemens AG TIM 1531 IRC, published on 29 Mar 2018. 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-2018-4841 in the wild and no public exploit code.

Affected product: Siemens AG TIM 1531 IRC. 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-2018-4841/ (Markdown: https://insights.sbomify.com/CVE-2018-4841/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4841
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4841
- OSV: https://osv.dev/vulnerability/CVE-2018-4841

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4841/
Summaries are generated and may contain mistakes; the official description above is the record.