# CVE-2021-32541: SysJust CTS Web - Broken Access Control

> Remote attackers can force logged-in users to log out by sending valid usernames, causing denial of service.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 May 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-549f-vmr8-2vjf

## What is CVE-2021-32541?

CVE-2021-32541 is a medium-severity authentication bypass vulnerability in SysJust CTS Web, published on 28 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The CTS Web transaction system related to authentication and session management is implemented incorrectly, which allows remote unauthenticated attackers can send a large number of valid usernames, and force those logged-in account to log out, causing the user to be unable to access the services

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2021-32541?

It affects 1 product.


Products: Sysjust Cts Web.

## How do I fix CVE-2021-32541?

No fix has been published for CVE-2021-32541 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32541 being exploited?

There is no known exploitation of CVE-2021-32541 in the wild and no public exploit code.

## Other vulnerabilities in SysJust CTS Web

- [CVE-2021-32543](https://insights.sbomify.com/CVE-2021-32543/): SysJust CTS Web - Broken Authentication (medium 6.5)
- [CVE-2021-32542](https://insights.sbomify.com/CVE-2021-32542/): SysJust CTS Web - Reflected XSS (medium 4.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32541 and fix it if it is affected.

What it is: CVE-2021-32541 is a medium-severity authentication bypass vulnerability in SysJust CTS Web, published on 28 May 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-2021-32541 in the wild and no public exploit code.

Affected product: SysJust CTS Web. 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-2021-32541/ (Markdown: https://insights.sbomify.com/CVE-2021-32541/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32541
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32541
- OSV: https://osv.dev/vulnerability/CVE-2021-32541

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32541/
Summaries are generated and may contain mistakes; the official description above is the record.