# CVE-2019-5274: Denial of service in USG9500

> An attacker can cause a denial of service on Huawei USG9500 firewalls by sending a malicious certificate that triggers an infinite loop in the X.509 implementation.

- **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:** 26 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-7f82-9q7c-v7p8

## What is CVE-2019-5274?

CVE-2019-5274 is a high-severity denial of service vulnerability in Huawei Usg9500 Firmware, published on 26 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

USG9500 with versions of V500R001C30;V500R001C60 have a denial of service vulnerability. Due to a flaw in the X.509 implementation in the affected products which can result in an infinite loop, an attacker may exploit the vulnerability via a malicious certificate to perform a denial of service attack on the affected products.

Weakness: CWE-835 (Loop with Unreachable Exit Condition)

## Which versions are affected by CVE-2019-5274?

It affects 1 product.


Products: Huawei Usg9500 Firmware.

## How do I fix CVE-2019-5274?

No fix has been published for CVE-2019-5274 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-5274 being exploited?

There is no known exploitation of CVE-2019-5274 in the wild and no public exploit code.

## Other vulnerabilities in Huawei Usg9500 Firmware

- [CVE-2020-1871](https://insights.sbomify.com/CVE-2020-1871/): Information disclosure in USG9500 (high 8.2)
- [CVE-2021-22309](https://insights.sbomify.com/CVE-2021-22309/): Weak cryptography in USG9500,USG9520,USG9560,USG9580 (high 7.5)
- [CVE-2019-5273](https://insights.sbomify.com/CVE-2019-5273/): Memory corruption in USG9500 (high 7.5)
- [CVE-2019-5275](https://insights.sbomify.com/CVE-2019-5275/): Memory corruption in USG9500 (high 7.5)
- [CVE-2017-8167](https://insights.sbomify.com/CVE-2017-8167/): Denial of service in USG9500 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-5274 and fix it if it is affected.

What it is: CVE-2019-5274 is a high-severity denial of service vulnerability in Huawei Usg9500 Firmware, published on 26 Dec 2019. 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-2019-5274 in the wild and no public exploit code.

Affected product: Huawei Usg9500 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-2019-5274/ (Markdown: https://insights.sbomify.com/CVE-2019-5274/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-5274
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-5274
- OSV: https://osv.dev/vulnerability/CVE-2019-5274

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-5274/
Summaries are generated and may contain mistakes; the official description above is the record.