# CVE-2023-43757: Weak cryptography in LAN-W300N/P

> An attacker can guess weak wireless encryption keys to intercept network traffic on affected ELECOM and LOGITEC routers.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Nov 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-hjvf-vwpv-9g29

## What is CVE-2023-43757?

CVE-2023-43757 is a medium-severity vulnerability in ELECOM CO.,LTD. LAN-W300N/P, published on 16 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Inadequate encryption strength vulnerability in multiple routers provided by ELECOM CO.,LTD. and LOGITEC CORPORATION allows a network-adjacent unauthenticated attacker to guess the encryption key used for wireless LAN communication and intercept the communication. As for the affected products/versions, see the information provided by the vendor under [References] section.

Weakness: CWE-326 (Inadequate Encryption Strength)

## Which versions are affected by CVE-2023-43757?

It affects 34 products.


Products: Elecom Lan-W300n\/P Firmware, Elecom Lan-W300n\/Rs Firmware, Elecom Lan-W301nr Firmware, Elecom Lan-Wh300n\/Dgp Firmware, Elecom Lan-Wh300ndgpe Firmware, Elecom Wrc-1167ghbk2 Firmware, Elecom Wrc-1167ghbk Firmware, Elecom Wrc-1750ghbk-E Firmware, Elecom Wrc-1750ghbk2-I Firmware, Elecom Wrc-1750ghbk Firmware, Elecom Wrc-2533ghbk-I Firmware, Elecom Wrc-2533ghbk2-T Firmware, Elecom Wrc-300febk Firmware, Elecom Wrc-300ghbk2-I Firmware, Elecom Wrc-300ghbk Firmware, Elecom Wrc-733febk Firmware, Elecom Wrc-733ghbk-C Firmware, Elecom Wrc-733ghbk-I Firmware, Elecom Wrc-733ghbk Firmware, Elecom Wrc-F1167acf Firmware and 14 more.

## How do I fix CVE-2023-43757?

No fix has been published for CVE-2023-43757 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43757 being exploited?

There is no known exploitation of CVE-2023-43757 in the wild and no public exploit code.

Public exploit code:

- https://github.com/sharmashreejaa/CVE-2023-43757 (github_poc): https://github.com/sharmashreejaa/CVE-2023-43757

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43757 and fix it if it is affected.

What it is: CVE-2023-43757 is a medium-severity vulnerability in ELECOM CO.,LTD. LAN-W300N/P, published on 16 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-43757 in the wild and no public exploit code.

Affected product: ELECOM CO.,LTD. LAN-W300N/P. 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-2023-43757/ (Markdown: https://insights.sbomify.com/CVE-2023-43757/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43757
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43757
- OSV: https://osv.dev/vulnerability/CVE-2023-43757

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-43757/
Summaries are generated and may contain mistakes; the official description above is the record.