# CVE-2018-13816: Auth bypass in TIM 1531 IRC

> An attacker can bypass authentication on port 102/tcp of the Siemens TIM 1531 IRC device, gaining unauthorized access without user interaction.

- **Severity:** Critical 10.0 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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:** 12 Dec 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-vx39-fw57-q8mc

## What is CVE-2018-13816?

CVE-2018-13816 is a critical authentication bypass vulnerability in Siemens AG TIM 1531 IRC, published on 12 Dec 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 version < V2.0). The devices was missing proper authentication on port 102/tcp, although configured. Successful exploitation requires an attacker to be able to send packets to port 102/tcp of the affected device. No user interaction and no user privileges are required to exploit the vulnerability. At the time of advisory publication no public exploitation of this vulnerability was known.

Weakness: CWE-287 (Improper Authentication), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2018-13816?

It affects 1 product.


Products: Siemens Tim 1531 Irc Firmware.

## How do I fix CVE-2018-13816?

No fix has been published for CVE-2018-13816 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-13816 being exploited?

There is no known exploitation of CVE-2018-13816 in the wild and no public exploit code.

## Other vulnerabilities in Siemens AG TIM 1531 IRC

- [CVE-2018-4841](https://insights.sbomify.com/CVE-2018-4841/): Auth bypass in TIM 1531 IRC (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-13816 and fix it if it is affected.

What it is: CVE-2018-13816 is a critical authentication bypass vulnerability in Siemens AG TIM 1531 IRC, published on 12 Dec 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-2018-13816 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-2018-13816/ (Markdown: https://insights.sbomify.com/CVE-2018-13816/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-13816
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-13816
- OSV: https://osv.dev/vulnerability/CVE-2018-13816

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-13816/
Summaries are generated and may contain mistakes; the official description above is the record.