# CVE-2021-30004: Other in n/a

> Attackers can forge attacks due to mishandled AlgorithmIdentifier parameters in wpa_supplicant and hostapd, bypassing security checks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:** Yes
- **Published:** 2 Apr 2021
- **Updated:** 7 Jul 2026
- **Also known as:** ALPINE-CVE-2021-30004, AZL-6974, DEBIAN-CVE-2021-30004, GHSA-mwxw-68wg-34jm, MGASA-2021-0254, SUSE-SU-2021:1125-1, SUSE-SU-2021:1166-1, openSUSE-SU-2021:0563-1

## What is CVE-2021-30004?

CVE-2021-30004 is a medium-severity vulnerability in n/a, published on 2 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In wpa_supplicant and hostapd 2.9, forging attacks may occur because AlgorithmIdentifier parameters are mishandled in tls/pkcs1.c and tls/x509v3.c.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-30004?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `wpa_supplicant` | SUSE:Linux Enterprise Micro 5.0 | All versions | 2.9-4.29.1 |
| `wpa_supplicant` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 2.9-4.29.1 |
| `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.9-23.12.1 |
| `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.9-23.12.1 |
| `wpa_supplicant` | openSUSE:Leap 15.2 | All versions | 2.9-lp152.8.12.1 |

Products: W1.fi Hostapd, W1.fi Wpa Supplicant.

## How do I fix CVE-2021-30004?

Apply the vendor's patch.

## Is CVE-2021-30004 being exploited?

There is no known exploitation of CVE-2021-30004 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2016-10743](https://insights.sbomify.com/CVE-2016-10743/): Weak cryptography in n/a (high 7.5)
- [CVE-2019-5061](https://insights.sbomify.com/CVE-2019-5061/): Denial of service in W1.f1 (high 7.4)
- [CVE-2019-5062](https://insights.sbomify.com/CVE-2019-5062/): Denial of service in W1.f1 (high 7.4)
- [CVE-2026-58374](https://insights.sbomify.com/CVE-2026-58374/): Memory corruption in hostapd (medium 6.5)
- [CVE-2022-37660](https://insights.sbomify.com/CVE-2022-37660/): Other in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30004 and fix it if it is affected.

What it is: CVE-2021-30004 is a medium-severity vulnerability in n/a, published on 2 Apr 2021. 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-2021-30004 in the wild and no public exploit code.

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-2021-30004/ (Markdown: https://insights.sbomify.com/CVE-2021-30004/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30004
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30004
- OSV: https://osv.dev/vulnerability/CVE-2021-30004

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30004/
Summaries are generated and may contain mistakes; the official description above is the record.