# CVE-2025-63721: Deserialization in n/a

> Attackers with normal user privileges can achieve remote code execution and server takeover via unsafe deserialization in the Snakeyaml component.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 8 Dec 2025
- **Updated:** 11 Dec 2025
- **Also known as:** GHSA-9hqp-6jv3-9h7w

## What is CVE-2025-63721?

CVE-2025-63721 is a critical unsafe deserialization vulnerability in n/a, published on 8 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

HummerRisk thru v1.5.0 is using a vulnerable Snakeyaml component, allowing attackers with normal user privileges to hit the /rule/add API and thereby achieve RCE and take over the server.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-63721?

It affects 1 product.


Products: Hummerrisk Hummerrisk.

## How do I fix CVE-2025-63721?

No fix has been published for CVE-2025-63721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-63721 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63721 exists.

## Other vulnerabilities in n/a

- [CVE-2023-43449](https://insights.sbomify.com/CVE-2023-43449/): Code injection in n/a (high 8.8)
- [CVE-2026-3064](https://insights.sbomify.com/CVE-2026-3064/): HummerRisk Cloud Task Scheduler ResourceCreateService.java command injection (medium 5.3)
- [CVE-2026-3065](https://insights.sbomify.com/CVE-2026-3065/): HummerRisk Cloud Task Dry-run CloudTaskService.java CommandUtils.commonExecCmdWithResult command injection (medium 5.3)
- [CVE-2026-3066](https://insights.sbomify.com/CVE-2026-3066/): HummerRisk Cloud Compliance Scanning PlatformUtils.java fixedCommand command injection (medium 5.3)
- [CVE-2026-3067](https://insights.sbomify.com/CVE-2026-3067/): HummerRisk Archive Extraction CommandUtils.java extractZip path traversal (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-63721 and fix it if it is affected.

What it is: CVE-2025-63721 is a critical unsafe deserialization vulnerability in n/a, published on 8 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-63721 exists.

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-2025-63721/ (Markdown: https://insights.sbomify.com/CVE-2025-63721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-63721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-63721
- OSV: https://osv.dev/vulnerability/CVE-2025-63721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-63721/
Summaries are generated and may contain mistakes; the official description above is the record.