Cisco Security Advisory
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CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
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Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business RV Series Routers. An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload. A memory leak or device reload would cause a denial of service (DoS) condition on an affected device.
For more information about these vulnerabilities, see the Details section of this advisory.
Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-multi-lldp-u7e4chCe
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Vulnerable Products
These vulnerabilities affect the following Cisco Small Business RV Series Routers if they are running a vulnerable firmware release and have LLDP enabled:
- RV132W ADSL2+ Wireless-N VPN Router
- RV134W VDSL2 Wireless-AC VPN Router
- RV160 VPN Router
- RV160W Wireless-AC VPN Router
- RV260 VPN Router
- RV260P VPN Router with PoE
- RV260W Wireless-AC VPN Router
- RV320 Dual Gigabit WAN VPN Router
- RV325 Dual Gigabit WAN VPN Router
- RV340 Dual WAN Gigabit VPN Router
- RV340W Dual WAN Gigabit Wireless-AC VPN Router
- RV345 Dual WAN Gigabit VPN Router
- RV345P Dual WAN Gigabit PoE VPN Router
For information about which Cisco firmware releases are vulnerable, see the Fixed Software section of this advisory.
LLDP Configurations
For Cisco RV132W, RV134W, RV320, and RV325 Routers, LLDP is enabled by default on all LAN ports and WAN interfaces.
For the following Cisco Small Business Routers, LLDP is enabled by default on the LAN ports and disabled by default on the WAN interfaces:
- RV160 VPN Router
- RV160W Wireless-AC VPN Router
- RV260 VPN Router
- RV260P VPN Router with PoE
- RV260W Wireless-AC VPN Router
- RV340 Dual WAN Gigabit VPN Router
- RV340W Dual WAN Gigabit Wireless-AC VPN Router
- RV345 Dual WAN Gigabit VPN Router
- RV345P Dual WAN Gigabit PoE VPN Router
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following Cisco products:
- RV016 Multi-WAN VPN Router
- RV042 Dual WAN VPN Router
- RV042G Dual Gigabit WAN VPN Router
- RV082 Dual WAN VPN Router
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These vulnerabilities are not dependent on one another. Exploitation of one of the vulnerabilities is not required to exploit another vulnerability. In addition, a software release that is affected by one of the vulnerabilities may not be affected by the other vulnerabilities.
Details about the vulnerabilities are as follows:
CVE-2021-1309: Cisco Small Business RV Series Routers Link Layer Discovery Protocol Remote Code Execution and Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV Series Routers could allow an unauthenticated, adjacent attacker to execute arbitrary code on an affected device or cause the device to reload.
This vulnerability is due to missing length validation of certain LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious LLDP packet to the targeted router. A successful exploit could allow the attacker to execute code on the affected router or cause it to reload unexpectedly, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s): CSCvw62392, CSCvw62410, CSCvw62413, and CSCvw62416
CVE ID: CVE-2021-1309
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2021-1251: Cisco Small Business RV Series Routers Link Layer Discovery Protocol Memory Leak Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV Series Routers could allow an unauthenticated, adjacent attacker to cause a memory leak on an affected device.
This vulnerability is due to missing length validation of certain LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious LLDP packet to the targeted router. A successful exploit could cause continuous memory consumption on an affected device and eventually cause it to reload, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s): CSCvw94339, CSCvw94341, CSCvw95016, CSCvw95017, and CSCvy01220
CVE ID: CVE-2021-1251
Security Impact Rating (SIR): High
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HCVE-2021-1308: Cisco Small Business RV Series Routers Link Layer Discovery Protocol Denial of Service Vulnerability
A vulnerability in the LLDP implementation for Cisco Small Business RV Series Routers could allow an unauthenticated, adjacent attacker to cause an affected router to reload unexpectedly.
This vulnerability is due to missing length validation of certain LLDP packet header fields. An attacker could exploit this vulnerability by sending a malicious LLDP packet to the targeted router. A successful exploit could allow the attacker to cause the affected router to reload unexpectedly, resulting in a DoS condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Bug ID(s): CSCvw62395, CSCvw62411, CSCvw62417, and CSCvw62418
CVE ID: CVE-2021-1308
Security Impact Rating (SIR): High
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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There are no workarounds that address these vulnerabilities.
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Cisco has released free software updates that address the vulnerabilities described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.htmlAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed firmware release as indicated in the following table(s):
Cisco Small Business RV Series Routers Fixed Releases RV132W 1.0.1.15 and later RV134W 1.0.1.21 and later RV160, RV160W, RV260, RV260P, and RV260W 1.0.01.03 and later RV320 and RV325 Refer to End-of-Sale and End-of-Life Announcement for the Cisco RV320 and RV325 Dual Gigabit WAN VPN Router. RV340, RV340W, RV345, and RV345P 1.0.03.22 and later1 1. The fixed release for CVE-2021-1251 that was listed in the original version of this advisory was found to be incomplete. To fix all vulnerabilities described in this advisory, upgrade to Release 1.0.03.22.To download the firmware from the Software Center on Cisco.com, do the following:
- Click Browse all.
- Choose Routers > Small Business Routers > Small Business RV Series Routers.
- Choose the appropriate router.
- Choose Small Business Router Firmware.
- Choose a release from the left pane of the product page.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
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Cisco would like to thank Qian Chen of Qihoo 360 Nirvan Team for reporting these vulnerabilities.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.2 Updated fixed release for CVE-2021-1251. Fixed Software Final 2021-AUG-04 1.1 Added that the RV320 and RV325 hardware platforms are vulnerable. Added that RV016, RV042, and RV082 are not vulnerable. Added Cisco bug ID CSCvy01220 to advisory header and to the details for CVE-2021-1251. Vulnerable Products, Products Confirmed Not Vulnerable, Details, and Fixed Software Final 2021-APR-15 1.0 Initial public release. — Final 2021-APR-07
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