# CVE-2023-43551: Improper Authentication in Multi-Mode Call Processor

> A rogue base station can bypass LTE authentication by skipping the authentication phase and sending a Security Mode Command directly.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jun 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-4h56-hghf-36cj

## What is CVE-2023-43551?

CVE-2023-43551 is a critical authentication bypass vulnerability in Qualcomm 315 5g Iot Modem Firmware, published on 3 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Cryptographic issue while performing attach with a LTE network, a rogue base station can skip the authentication phase and immediately send the Security Mode Command.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2023-43551?

It affects 241 products.


Products: Qualcomm 205 Mobile Firmware, Qualcomm 215 Mobile Firmware, Qualcomm 315 5g Iot Modem Firmware, Qualcomm 9205 Lte Modem Firmware, Qualcomm 9206 Lte Modem Firmware, Qualcomm 9207 Lte Modem Firmware, Qualcomm Apq8017 Firmware, Qualcomm Apq8037 Firmware, Qualcomm Aqt1000 Firmware, Qualcomm Ar6003 Firmware, Qualcomm Ar8035 Firmware, Qualcomm C-V2x 9150 Firmware, Qualcomm Csra6620 Firmware, Qualcomm Csra6640 Firmware, Qualcomm Csrb31024 Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware and 221 more.

## How do I fix CVE-2023-43551?

No fix has been published for CVE-2023-43551 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43551 being exploited?

There is no known exploitation of CVE-2023-43551 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm 315 5g Iot Modem Firmware

- [CVE-2024-21471](https://insights.sbomify.com/CVE-2024-21471/): Use After Free in Graphics Linux (high 8.4)
- [CVE-2024-21468](https://insights.sbomify.com/CVE-2024-21468/): Use After Free in Kernel (high 8.4)
- [CVE-2023-33066](https://insights.sbomify.com/CVE-2023-33066/): Use of Out-of-range Pointer Offset in Audio (high 8.4)
- [CVE-2025-21427](https://insights.sbomify.com/CVE-2025-21427/): Buffer Over-read in Data HLOS - LNX (high 8.2)
- [CVE-2025-21453](https://insights.sbomify.com/CVE-2025-21453/): Use After Free in GPS HLOS Driver (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43551 and fix it if it is affected.

What it is: CVE-2023-43551 is a critical authentication bypass vulnerability in Qualcomm 315 5g Iot Modem Firmware, published on 3 Jun 2024. 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-2023-43551 in the wild and no public exploit code.

Affected product: Qualcomm 315 5g Iot Modem Firmware. 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-2023-43551/ (Markdown: https://insights.sbomify.com/CVE-2023-43551/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43551
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43551
- OSV: https://osv.dev/vulnerability/CVE-2023-43551

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43551/
Summaries are generated and may contain mistakes; the official description above is the record.