# CVE-2023-49955: Denial of service in n/a

> Attackers can cause server instability and denial of service by sending excessively large chargePointVendor fields in BootNotification messages.

- **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:** 7 Dec 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-r83w-76v6-vh75

## What is CVE-2023-49955?

CVE-2023-49955 is a high-severity denial of service vulnerability in n/a, published on 7 Dec 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in Dalmann OCPP.Core before 1.2.0 for OCPP (Open Charge Point Protocol) for electric vehicles. It does not validate the length of the chargePointVendor field in a BootNotification message, potentially leading to server instability and a denial of service when processing excessively large inputs. NOTE: the vendor's perspective is "OCPP.Core is intended for use in a protected environment/network."

## Which versions are affected by CVE-2023-49955?

It affects 1 product.


Products: Dallmann-Consulting Open Charge Point Protocol.

## How do I fix CVE-2023-49955?

No fix has been published for CVE-2023-49955 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-49955 being exploited?

There is no known exploitation of CVE-2023-49955 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-49956](https://insights.sbomify.com/CVE-2023-49956/): Business logic in n/a (high 7.5)
- [CVE-2023-49957](https://insights.sbomify.com/CVE-2023-49957/): Business logic in n/a (high 7.5)
- [CVE-2023-49958](https://insights.sbomify.com/CVE-2023-49958/): Business logic in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49955 and fix it if it is affected.

What it is: CVE-2023-49955 is a high-severity denial of service vulnerability in n/a, published on 7 Dec 2023. 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-2023-49955 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-2023-49955/ (Markdown: https://insights.sbomify.com/CVE-2023-49955/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49955
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49955
- OSV: https://osv.dev/vulnerability/CVE-2023-49955

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49955/
Summaries are generated and may contain mistakes; the official description above is the record.