# CVE-2025-21452: Reachable Assertion in Modem

> A reachable assertion in the modem firmware allows a transient denial of service when processing invalid LTE network responses.

- **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:** 6 Aug 2025
- **Updated:** 6 Aug 2025
- **Also known as:** GHSA-9jx4-fvc9-gc34

## What is CVE-2025-21452?

CVE-2025-21452 is a high-severity denial of service vulnerability in Qualcomm 315 5g Iot Modem Firmware, published on 6 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Transient DOS while processing a random-access response (RAR) with an invalid PDU length on LTE network.

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2025-21452?

It affects 80 products.


Products: Qualcomm 315 5g Iot Modem Firmware, Qualcomm Ar8035 Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fsm10055 Firmware, Qualcomm Qca6174a Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6421 Firmware, Qualcomm Qca6426 Firmware, Qualcomm Qca6431 Firmware, Qualcomm Qca6436 Firmware, Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qca6696 Firmware, Qualcomm Qca6698aq Firmware, Qualcomm Qca8337 Firmware, Qualcomm Qcm5430 Firmware and 60 more.

## How do I fix CVE-2025-21452?

No fix has been published for CVE-2025-21452 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-21452 being exploited?

There is no known exploitation of CVE-2025-21452 in the wild and no public exploit code.

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

- [CVE-2023-33107](https://insights.sbomify.com/CVE-2023-33107/): Qualcomm Multiple Chipsets Integer Overflow (high 8.4, exploited in the wild)
- [CVE-2023-33063](https://insights.sbomify.com/CVE-2023-33063/): Qualcomm Multiple Chipsets Use-After-Free (high 7.8, exploited in the wild)
- [CVE-2025-27034](https://insights.sbomify.com/CVE-2025-27034/): Improper Validation of Array Index in Multi-Mode Call Processor (critical 9.8)
- [CVE-2023-22388](https://insights.sbomify.com/CVE-2023-22388/): Use of Out-of-range Pointer Offset in Multi-mode Call Processor (critical 9.8)
- [CVE-2023-28578](https://insights.sbomify.com/CVE-2023-28578/): Improper Input Validation in Services (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-21452 and fix it if it is affected.

What it is: CVE-2025-21452 is a high-severity denial of service vulnerability in Qualcomm 315 5g Iot Modem Firmware, published on 6 Aug 2025. 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-2025-21452 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-2025-21452/ (Markdown: https://insights.sbomify.com/CVE-2025-21452/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21452
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21452
- OSV: https://osv.dev/vulnerability/CVE-2025-21452

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21452/
Summaries are generated and may contain mistakes; the official description above is the record.