CVE-2020-3357CWE-20

Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Remote Code Execution and Denial of Service Vulnerability

Critical · published July 16, 2020

CVSS v3.1
9.8
EPSS
4%
Percentile
91.0
In the wild
Unconfirmed
What it is

🚨 A crafted HTTP request could let an attacker execute arbitrary code on your router — no authentication needed! 🔥 Think of it like a delivery person who can drop off any package without needing to show an ID. If they send over something malicious, your router might just take it in, resulting in a messy situation! This vulnerability is absolutely devastating. An attacker could gain complete control of your router, potentially snooping on your network traffic and even causing it to crash. Not only could your devices be at risk, but your entire network could also be rendered useless due to the denial of service condition.

Put simply

Think of it like a delivery person who can drop off any package without needing to show an ID. If they send over something malicious, your router might just take it in, resulting in a messy situation! The flaw arises from improper validation of HTTP requests within the SSL VPN feature of Cisco Small Business RV340 series routers. By sending a specially crafted HTTP request over an SSL connection, an unauthenticated attacker could execute arbitrary code or force the device to reload.

What to do

This vulnerability is absolutely devastating. An attacker could gain complete control of your router, potentially snooping on your network traffic and even causing it to crash. Not only could your devices be at risk, but your entire network could also be rendered useless due to the denial of service condition. Patch your devices immediately to the latest firmware version available from Cisco. Review your network configurations to ensure they follow best security practices and consider restricting VPN access as an additional precaution. Stay vigilant and monitor your network traffic for any suspicious activity. You've got this! Follow these steps and you'll be back in the safety zone in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.04236 · 91.0th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2020-07-16T17:21Z
EPSS history
Timeline
  • 16 JUL 17:21Z
    Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers SSL Remote Code Execution and Denial of Service Vulnerability
    cvelistv5