# CVE-2021-3553: Server-Side Request Forgery in EPPUpdateService remote config file (VA-9825)

> An attacker can exploit an SSRF vulnerability in Bitdefender Endpoint Security Tools to use the endpoint as a proxy for remote hosts.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Nov 2021
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-6x2g-jp65-m547

## What is CVE-2021-3553?

CVE-2021-3553 is a medium-severity server-side request forgery vulnerability in Bitdefender Endpoint Security Tools, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService of Bitdefender Endpoint Security Tools allows an attacker to use the Endpoint Protection relay as a proxy for any remote host. This issue affects: Bitdefender Endpoint Security Tools versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint for Linux versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2021-3553?

It affects 2 products.


Products: Bitdefender Endpoint Security Tools, Bitdefender Gravityzone.

## How do I fix CVE-2021-3553?

No fix has been published for CVE-2021-3553 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3553 being exploited?

There is no known exploitation of CVE-2021-3553 in the wild and no public exploit code.

## Other vulnerabilities in Bitdefender Endpoint Security Tools

- [CVE-2021-3554](https://insights.sbomify.com/CVE-2021-3554/): Improper Access Control vulnerability in the patchesUpdate API (critical 9.0)
- [CVE-2021-3576](https://insights.sbomify.com/CVE-2021-3576/): Privilege escalation via SeImpersonatePrivilege (high 7.8)
- [CVE-2021-3579](https://insights.sbomify.com/CVE-2021-3579/): Incorrect Default Permissions vulnerability in bdservicehost.exe and Vulnerability.Scan.exe (high 7.8)
- [CVE-2022-0677](https://insights.sbomify.com/CVE-2022-0677/): Improper Handling of Length Parameter Inconsistency vulnerability in Bitdefender Update Server (VA-10144) (high 7.5)
- [CVE-2021-3485](https://insights.sbomify.com/CVE-2021-3485/): Improper Input Validation in Bitdefender Endpoint Security Tools for Linux (medium 6.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3553 and fix it if it is affected.

What it is: CVE-2021-3553 is a medium-severity server-side request forgery vulnerability in Bitdefender Endpoint Security Tools, published on 24 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-3553 in the wild and no public exploit code.

Affected product: Bitdefender Endpoint Security Tools. 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-2021-3553/ (Markdown: https://insights.sbomify.com/CVE-2021-3553/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3553
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3553
- OSV: https://osv.dev/vulnerability/CVE-2021-3553

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3553/
Summaries are generated and may contain mistakes; the official description above is the record.