CVE-2021-1320

What it is

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly. These vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities 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. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on the affected device.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. High risk of data exposure, data tampering, service disruption.

Exploit odds

2.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-02-04 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:31 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.3% in the next 30 days (EPSS).
• Severity: 7.2 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-02-04 17:15 UTC

Last modified

2026-06-17 03:31 UTC

Exploit probability

2.3% · EPSS, next 30 days

Weakness

CWE-121

Record status

Modified

Affected

• Cisco rv016 multi-wan Vpn Router Firmware ≤ 4.2.3.14
• Cisco rv042 Dual Wan Vpn Router Firmware ≤ 4.2.3.14
• Cisco rv042g Dual Gigabit Wan Vpn Router Firmware ≤ 4.2.3.14
• Cisco rv082 Dual Wan Vpn Router Firmware ≤ 4.2.3.14
• Cisco rv320 Dual Gigabit Wan Vpn Router Firmware ≤ 1.5.1.11
• Cisco rv325 Dual Gigabit Wan Vpn Router Firmware ≤ 1.5.1.11

Attack profile CVSS 3.1 · 7.2

Attack vector

Network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-1320.md and follow it. Check whether this project is affected by CVE-2021-1320. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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