# CVE-2021-37759: Information disclosure in n/a

> Attackers can escalate privileges by reading leaked session IDs from DEBUG logs in Graylog, requiring debug logging to be enabled.

- **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:** 31 Jul 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f9j4-c45h-7xwv

## What is CVE-2021-37759?

CVE-2021-37759 is a critical vulnerability in n/a, published on 31 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Session ID leak in the DEBUG log file in Graylog before 4.1.2 allows attackers to escalate privileges (to the access level of the leaked session ID).

Weakness: CWE-532 (Insertion of Sensitive Information into Log File)

## Which versions are affected by CVE-2021-37759?

It affects 1 product.


Products: Graylog Graylog.

## How do I fix CVE-2021-37759?

No fix has been published for CVE-2021-37759 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-37759 being exploited?

There is no known exploitation of CVE-2021-37759 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-37760](https://insights.sbomify.com/CVE-2021-37760/): Information disclosure in n/a (critical 9.8)
- [CVE-2026-1435](https://insights.sbomify.com/CVE-2026-1435/): Incorrect management of session invalidation vulnerability in Graylog Web Interface (critical 9.3)
- [CVE-2025-53106](https://insights.sbomify.com/CVE-2025-53106/): Graylog vulnerable to privilege escalation through API tokens (high 8.8)
- [CVE-2024-24824](https://insights.sbomify.com/CVE-2024-24824/): graylog2-server vulnerable to instantiation of arbitrary classes triggered by API request (high 8.8)
- [CVE-2020-15813](https://insights.sbomify.com/CVE-2020-15813/): Improper Certificate Validation in Graylog (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-37759 and fix it if it is affected.

What it is: CVE-2021-37759 is a critical vulnerability in n/a, published on 31 Jul 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-2021-37759 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-2021-37759/ (Markdown: https://insights.sbomify.com/CVE-2021-37759/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-37759
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-37759
- OSV: https://osv.dev/vulnerability/CVE-2021-37759

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-37759/
Summaries are generated and may contain mistakes; the official description above is the record.