# CVE-2021-45671: Cross-site scripting in n/a

> Stored XSS in NETGEAR router firmware allows attackers to inject scripts, potentially leading to session hijacking or malicious actions.

- **Severity:** Medium 6.5 (`CVSS:3.1/AC:H/AV:A/A:L/C:L/I:H/PR:H/S:C/UI:R`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-fq8h-4493-3g4m

## What is CVE-2021-45671?

CVE-2021-45671 is a medium-severity cross-site scripting vulnerability in Netgear R7900 Firmware, published on 26 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Certain NETGEAR devices are affected by stored XSS. This affects CBR40 before 2.5.0.10, EAX80 before 1.0.1.62, EX7500 before 1.0.0.72, R7900 before 1.0.4.38, R8000 before 1.0.4.68, RAX200 before 1.0.4.120, RBS40V before 2.6.1.4, RBW30 before 2.6.1.4, MR60 before 1.0.6.110, RAX20 before 1.0.2.82, RAX45 before 1.0.2.72, RAX80 before 1.0.4.120, MS60 before 1.0.6.110, RAX15 before 1.0.2.82, RAX50 before 1.0.2.72, RAX75 before 1.0.4.120, RBR750 before 3.2.16.6, RBR850 before 3.2.16.6, RBS750 before 3.2.16.6, RBS850 before 3.2.16.6, RBK752 before 3.2.16.6, and RBK852 before 3.2.16.6.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-45671?

It affects 22 products.


Products: Netgear Cbr40 Firmware, Netgear Eax80 Firmware, Netgear Ex7500 Firmware, Netgear Mr60 Firmware, Netgear Ms60 Firmware, Netgear R7900 Firmware, Netgear R8000 Firmware, Netgear Rax15 Firmware, Netgear Rax200 Firmware, Netgear Rax20 Firmware, Netgear Rax45 Firmware, Netgear Rax50 Firmware, Netgear Rax75 Firmware, Netgear Rax80 Firmware, Netgear Rbk752 Firmware, Netgear Rbk852 Firmware, Netgear Rbr750 Firmware, Netgear Rbr850 Firmware, Netgear Rbs40v Firmware, Netgear Rbs750 Firmware and 2 more.

## How do I fix CVE-2021-45671?

No fix has been published for CVE-2021-45671 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-45671 being exploited?

There is no known exploitation of CVE-2021-45671 in the wild and no public exploit code.

## Other vulnerabilities in Netgear R7900 Firmware

- [CVE-2021-45630](https://insights.sbomify.com/CVE-2021-45630/): Command injection in n/a (critical 10.0)
- [CVE-2023-36187](https://insights.sbomify.com/CVE-2023-36187/): Memory corruption in n/a (critical 9.8)
- [CVE-2021-45617](https://insights.sbomify.com/CVE-2021-45617/): Command injection in n/a (critical 9.8)
- [CVE-2021-45504](https://insights.sbomify.com/CVE-2021-45504/): Auth bypass in n/a (critical 9.6)
- [CVE-2021-45507](https://insights.sbomify.com/CVE-2021-45507/): Auth bypass in n/a (critical 9.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45671 and fix it if it is affected.

What it is: CVE-2021-45671 is a medium-severity cross-site scripting vulnerability in Netgear R7900 Firmware, published on 26 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-45671 in the wild and no public exploit code.

Affected product: Netgear R7900 Firmware. 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-2021-45671/ (Markdown: https://insights.sbomify.com/CVE-2021-45671/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45671
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45671
- OSV: https://osv.dev/vulnerability/CVE-2021-45671

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45671/
Summaries are generated and may contain mistakes; the official description above is the record.