# CVE-2021-1287: Command injection in Cisco Small Business RV Series Router Firmware

> Authenticated attackers can execute arbitrary code as root or cause a denial of service on Cisco RV132W and RV134W routers via crafted HTTP requests.

- **Severity:** High 7.2 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Mar 2021
- **Updated:** 8 Nov 2024
- **Also known as:** GHSA-rh36-49q6-fm2j

## What is CVE-2021-1287?

CVE-2021-1287 is a high-severity command injection vulnerability in Cisco Small Business RV Series Router Firmware, published on 18 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability in the web-based management interface of Cisco RV132W ADSL2+ Wireless-N VPN Routers and Cisco RV134W VDSL2 Wireless-AC VPN Routers could allow an authenticated, remote attacker to execute arbitrary code on an affected device or cause the device to restart unexpectedly. The vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition on the affected device.

Weakness: CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2021-1287?

It affects 2 products.


Products: Cisco Rv132w Firmware, Cisco Rv134w Firmware.

## How do I fix CVE-2021-1287?

No fix has been published for CVE-2021-1287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1287 being exploited?

There is no known exploitation of CVE-2021-1287 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Small Business RV Series Router Firmware

- [CVE-2018-0125](https://insights.sbomify.com/CVE-2018-0125/): Cisco VPN Routers Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0127](https://insights.sbomify.com/CVE-2018-0127/): Missing authorization in Cisco RV132W and RV134W Wireless VPN Routers (critical 9.8)
- [CVE-2021-1251](https://insights.sbomify.com/CVE-2021-1251/): Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities (high 7.4)
- [CVE-2021-1308](https://insights.sbomify.com/CVE-2021-1308/): Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities (high 7.4)
- [CVE-2021-1309](https://insights.sbomify.com/CVE-2021-1309/): Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities (high 7.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1287 and fix it if it is affected.

What it is: CVE-2021-1287 is a high-severity command injection vulnerability in Cisco Small Business RV Series Router Firmware, published on 18 Mar 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-1287 in the wild and no public exploit code.

Affected product: Cisco Small Business RV Series Router 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-2021-1287/ (Markdown: https://insights.sbomify.com/CVE-2021-1287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1287
- OSV: https://osv.dev/vulnerability/CVE-2021-1287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1287/
Summaries are generated and may contain mistakes; the official description above is the record.