# CVE-2021-33054: Auth bypass in n/a

> Attackers can impersonate users by bypassing SAML signature validation in SOGo when SAML authentication is enabled.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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:** Yes
- **Published:** 4 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-33054, DLA-2707-1, DSA-5029-1, GHSA-5x58-gqg4-wfvq, MGASA-2022-0481, UBUNTU-CVE-2021-33054

## What is CVE-2021-33054?

CVE-2021-33054 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 4 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SOGo 2.x before 2.4.1 and 3.x through 5.x before 5.1.1 does not validate the signatures of any SAML assertions it receives. Any actor with network access to the deployment could impersonate users when SAML is the authentication method. (Only versions after 2.0.5a are affected.)

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2021-33054?

It affects 2 products.


Products: Debian Debian Linux, Inverse Sogo.

## How do I fix CVE-2021-33054?

Upgrade to a fixed version.

## Is CVE-2021-33054 being exploited?

There is no known exploitation of CVE-2021-33054 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33054 and fix it if it is affected.

What it is: CVE-2021-33054 is a high-severity authentication bypass vulnerability in Debian Debian Linux, published on 4 Jun 2021. 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-2021-33054 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2021-33054/ (Markdown: https://insights.sbomify.com/CVE-2021-33054/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33054
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33054
- OSV: https://osv.dev/vulnerability/CVE-2021-33054

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-33054/
Summaries are generated and may contain mistakes; the official description above is the record.