Memory leak in Cisco Systems, Inc products - CVE-2021-1251

Vulnerability identifier: #VU51990

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-1251

CWE-ID: CWE-401

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due to missing length validation of certain LLDP packet header fields. A remote attacker on the local network can send a specially crafted LLDP packet and perform denial of service attack.

RV132W ADSL2+ Wireless-N VPN Router
Cisco Small Business RV160 Series VPN Router
Cisco Small Business RV160W Wireless-AC VPN Router
Cisco Small Business RV260 VPN Router
Cisco Small Business RV260P VPN Router with POE
Cisco Small Business RV260W Wireless-AC VPN Router
RV134W VDSL2 Wireless-AC VPN Router
Cisco RV340 Dual WAN Gigabit VPN Router
Cisco RV340W Dual WAN Gigabit Wireless-AC VPN Router
Cisco RV345 Dual WAN Gigabit VPN Router
Cisco RV345P Dual WAN Gigabit VPN Router

Install updates from vendor's website.

RV132W ADSL2+ Wireless-N VPN Router - update to 1.0.1.15
Cisco Small Business RV160 Series VPN Router - update to 1.0.01.03
Cisco Small Business RV160W Wireless-AC VPN Router - update to 1.0.01.03
Cisco Small Business RV260 VPN Router - update to 1.0.01.03
Cisco Small Business RV260P VPN Router with POE - update to 1.0.01.03
Cisco Small Business RV260W Wireless-AC VPN Router - update to 1.0.01.03
RV134W VDSL2 Wireless-AC VPN Router - update to 1.0.1.21
Cisco RV340 Dual WAN Gigabit VPN Router - update to 1.0.03.21
Cisco RV340W Dual WAN Gigabit Wireless-AC VPN Router - update to 1.0.03.21
Cisco RV345 Dual WAN Gigabit VPN Router - update to 1.0.03.21
Cisco RV345P Dual WAN Gigabit VPN Router - update to 1.0.03.21

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-multi-lldp-u7e4chCe

• Multiple vulnerabilities in Cisco Small Business RV Series Routers