# CVE-2021-37182: Denial of service in SCALANCE XM408-4C

> An unauthenticated remote attacker can cause network interruptions by sending crafted OSPF packets to affected Siemens SCALANCE switches with OSPF enabled.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 14 Jun 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-p4gg-xc3g-rqm7

## What is CVE-2021-37182?

CVE-2021-37182 is a high-severity denial of service vulnerability in Siemens SCALANCE XM408-4C, published on 14 Jun 2022. 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 SCALANCE XM408-4C (All versions < V6.5), SCALANCE XM408-4C (L3 int.) (All versions < V6.5), SCALANCE XM408-8C (All versions < V6.5), SCALANCE XM408-8C (L3 int.) (All versions < V6.5), SCALANCE XM416-4C (All versions < V6.5), SCALANCE XM416-4C (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 1x230V (All versions < V6.5), SCALANCE XR524-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 24V (All versions < V6.5), SCALANCE XR524-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR524-8C, 2x230V (All versions < V6.5), SCALANCE XR524-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 1x230V (All versions < V6.5), SCALANCE XR526-8C, 1x230V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 24V (All versions < V6.5), SCALANCE XR526-8C, 24V (L3 int.) (All versions < V6.5), SCALANCE XR526-8C, 2x230V (All versions < V6.5), SCALANCE XR526-8C, 2x230V (L3 int.) (All versions < V6.5), SCALANCE XR528-6M (All versions < V6.5), SCALANCE XR528-6M (2HR2) (All versions < V6.5), SCALANCE XR528-6M (2HR2, L3 int.) (All versions < V6.5), SCALANCE XR528-6M (L3 int.) (All versions < V6.5), SCALANCE XR552-12M (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2) (All versions < V6.5), SCALANCE XR552-12M (2HR2, L3 int.) (All versions < V6.5). The OSPF protocol implementation in affected devices fails to verify the checksum and length fields in the OSPF LS Update messages. An unauthenticated remote attacker could exploit this vulnerability to cause interruptions in the network by sending specially crafted OSPF packets. Successful exploitation requires OSPF to be enabled on an affected device.

Weakness: CWE-354 (Improper Validation of Integrity Check Value)

## Which versions are affected by CVE-2021-37182?

It affects 17 products.


Products: Siemens Scalance Xm408-4c Firmware, Siemens Scalance Xm408-4c L3 Firmware, Siemens Scalance Xm408-8c Firmware, Siemens Scalance Xm408-8c L3 Firmware, Siemens Scalance Xm416-4c Firmware, Siemens Scalance Xm416-4c L3 Firmware, Siemens Scalance Xr524-8c Firmware, Siemens Scalance Xr524-8c L3 Firmware, Siemens Scalance Xr526-8c Firmware, Siemens Scalance Xr526-8c L3 Firmware, Siemens Scalance Xr528-6m 2hr2 Firmware, Siemens Scalance Xr528-6m 2hr2 L3 Firmware, Siemens Scalance Xr528-6m Firmware, Siemens Scalance Xr528-6m L3 Firmware, Siemens Scalance Xr552-12m 2hr2 Firmware, Siemens Scalance Xr552-12m 2hr2 L3 Firmware, Siemens Scalance Xr552-12m Firmware.

## How do I fix CVE-2021-37182?

No fix has been published for CVE-2021-37182 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-37182 being exploited?

There is no known exploitation of CVE-2021-37182 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-37182 and fix it if it is affected.

What it is: CVE-2021-37182 is a high-severity denial of service vulnerability in Siemens SCALANCE XM408-4C, published on 14 Jun 2022. 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-2021-37182 in the wild and no public exploit code.

Affected product: Siemens SCALANCE XM408-4C. 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-2021-37182/ (Markdown: https://insights.sbomify.com/CVE-2021-37182/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37182
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37182
- OSV: https://osv.dev/vulnerability/CVE-2021-37182

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-37182/
Summaries are generated and may contain mistakes; the official description above is the record.