# CVE-2021-27771: HCL Sametime is susceptible a file transfer service vulnerability

> Attackers can modify session IDs to upload arbitrary files or delete directories, leading to code execution or denial of service in HCL Sametime.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 May 2022
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-3jcp-j236-2qqc

## What is CVE-2021-27771?

CVE-2021-27771 is a high-severity vulnerability in HCL Software Sametime, published on 12 May 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2021-27771?

It affects 1 product.


Products: Hcltech Sametime.

## How do I fix CVE-2021-27771?

No fix has been published for CVE-2021-27771 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-27771 being exploited?

There is no known exploitation of CVE-2021-27771 in the wild and no public exploit code.

## Other vulnerabilities in HCL Software Sametime

- [CVE-2021-27772](https://insights.sbomify.com/CVE-2021-27772/): HCL Sametime is vulnerable to an information disclosure (high 7.1)
- [CVE-2021-27770](https://insights.sbomify.com/CVE-2021-27770/): HCL Sametime is vulnerable to arbitrary HTTP requests (medium 6.8)
- [CVE-2022-42446](https://insights.sbomify.com/CVE-2022-42446/): HCL Sametime 12.0 and 12.0FP1 anonymous users have directory lookup access (medium 6.5)
- [CVE-2023-50349](https://insights.sbomify.com/CVE-2023-50349/): HCL Sametime is impacted by a Cross Site Request Forgery (CSRF) vulnerability (medium 5.9)
- [CVE-2024-30122](https://insights.sbomify.com/CVE-2024-30122/): HCL Sametime is impacted by misconfigured security related HTTP headers (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-27771 and fix it if it is affected.

What it is: CVE-2021-27771 is a high-severity vulnerability in HCL Software Sametime, published on 12 May 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-27771 in the wild and no public exploit code.

Affected product: HCL Software Sametime. 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-2021-27771/ (Markdown: https://insights.sbomify.com/CVE-2021-27771/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27771
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27771
- OSV: https://osv.dev/vulnerability/CVE-2021-27771

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-27771/
Summaries are generated and may contain mistakes; the official description above is the record.