CVE-2021-1520 Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Local Privilege Escalation Vulnerability
Authenticated local attackers can execute arbitrary commands with root privileges on Cisco RV series routers due to improper input sanitization in internal messaging.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-1520?
CVE-2021-1520 is a medium-severity command injection vulnerability in Cisco Small Business RV Series Router Firmware, published on 6 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the internal message processing of Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an authenticated, local attacker to run arbitrary commands with root privileges on the underlying operating system (OS). This vulnerability exists because an internal messaging service does not properly sanitize input. An attacker could exploit this vulnerability by first authenticating to the device and then sending a crafted request to the internal service. A successful exploit could allow the attacker to run arbitrary commands with root privileges on the underlying OS. To exploit this vulnerability, the attacker must have valid Administrator credentials for the device.
Weakness: CWE-123
Which versions are affected by CVE-2021-1520?
It affects 4 products.
Products include Cisco Rv340 Firmware, Cisco Rv340w Firmware, Cisco Rv345 Firmware, Cisco Rv345p Firmware.
How do I fix CVE-2021-1520?
No fix has been published for CVE-2021-1520 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-1520 being exploited?
There is no known exploitation of CVE-2021-1520 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business RV Series Router Firmware
- CVE-2022-20699 Cisco Small Business RV Series Routers Stack-based Buffer Overflow
- CVE-2022-20701 Cisco Small Business RV Series Routers Stack-based Buffer Overflow
- CVE-2022-20708 Cisco Small Business RV Series Routers Stack-based Buffer Overflow
- CVE-2022-20707 Cisco Small Business RV Series Routers Vulnerabilities
- CVE-2022-20709 Cisco Small Business RV Series Routers Vulnerabilities
Sources
Also known as GHSA-4vxg-6hgq-qr48.