# CVE-2024-49849: Deserialization in SIMATIC S7-PLCSIM V16

> Attackers can execute arbitrary code by exploiting improper input sanitization during log file parsing in Siemens industrial automation software.

- **Severity:** High 8.4 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Dec 2024
- **Updated:** 13 Oct 2026
- **Also known as:** GHSA-wcc9-3f5j-wxhw

## What is CVE-2024-49849?

CVE-2024-49849 is a high-severity unsafe deserialization vulnerability in Siemens SIMATIC S7-PLCSIM V16, published on 10 Dec 2024. 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

A vulnerability has been identified in SIMATIC S7-PLCSIM V16 (All versions), SIMATIC S7-PLCSIM V17 (All versions), SIMATIC STEP 7 Safety V16 (All versions), SIMATIC STEP 7 Safety V17 (All versions < V17 Update 9), SIMATIC STEP 7 Safety V18 (All versions < V18 Update 6), SIMATIC STEP 7 Safety V19 (All versions < V19 Update 4), SIMATIC STEP 7 V16 (All versions), SIMATIC STEP 7 V17 (All versions < V17 Update 9), SIMATIC STEP 7 V18 (All versions < V18 Update 6), SIMATIC STEP 7 V19 (All versions < V19 Update 4), SIMATIC WinCC Unified V16 (All versions), SIMATIC WinCC Unified V17 (All versions < V17 Update 9), SIMATIC WinCC Unified V18 (All versions < V18 Update 6), SIMATIC WinCC Unified V19 (All versions < V19 Update 4), SIMATIC WinCC V16 (All versions), SIMATIC WinCC V17 (All versions < V17 Update 9), SIMATIC WinCC V18 (All versions < V18 Update 6), SIMATIC WinCC V19 (All versions < V19 Update 4), SIMOCODE ES V16 (All versions), SIMOCODE ES V17 (All versions), SIMOCODE ES V18 (All versions), SIMOCODE ES V19 (All versions), SIMOTION SCOUT TIA V5.4 (All versions), SIMOTION SCOUT TIA V5.5 (All versions), SIMOTION SCOUT TIA V5.6 (All versions < V5.6 SP1 HF7), SINAMICS Startdrive V16 (All versions), SINAMICS Startdrive V17 (All versions), SINAMICS Startdrive V18 (All versions), SINAMICS Startdrive V19 (All versions), SIRIUS Safety ES V17 (TIA Portal) (All versions), SIRIUS Safety ES V18 (TIA Portal) (All versions < V18 Update 6), SIRIUS Safety ES V19 (TIA Portal) (All versions), SIRIUS Soft Starter ES V17 (TIA Portal) (All versions), SIRIUS Soft Starter ES V18 (TIA Portal) (All versions), SIRIUS Soft Starter ES V19 (TIA Portal) (All versions), TIA Portal Cloud V16 (All versions), TIA Portal Cloud V17 (All versions), TIA Portal Cloud V18 (All versions < V6.3.0.2), TIA Portal Cloud V19 (All versions < V5.2.1.1). Affected products do not properly sanitize user-controllable input when parsing log files. This could allow an attacker to cause a type confusion and execute arbitrary code within the affected application.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2024-49849?


## How do I fix CVE-2024-49849?

No fix has been published for CVE-2024-49849 yet. Limit exposure of the affected software until one is available.

## Is CVE-2024-49849 being exploited?

There is no known exploitation of CVE-2024-49849 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-49849 and fix it if it is affected.

What it is: CVE-2024-49849 is a high-severity unsafe deserialization vulnerability in Siemens SIMATIC S7-PLCSIM V16, published on 10 Dec 2024. 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: There is no known exploitation of CVE-2024-49849 in the wild and no public exploit code.

Affected product: Siemens SIMATIC S7-PLCSIM V16. 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-2024-49849/ (Markdown: https://insights.sbomify.com/CVE-2024-49849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-49849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-49849
- OSV: https://osv.dev/vulnerability/CVE-2024-49849

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From sbomify Insights: https://insights.sbomify.com/CVE-2024-49849/
Summaries are generated and may contain mistakes; the official description above is the record.