high
8.8
CWE
401 119
Advisory Published
Updated

CVE-2021-1309: Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities

First published: Thu Apr 08 2021(Updated: )

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).

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco RV132W Firmware=1.0.0.14
Cisco RV132W Firmware=1.0.1.14
Cisco RV132W Firmware=1.0.1.20
Cisco RV132W Firmware
Cisco RV134W Firmware=1.0.0.14
Cisco RV134W Firmware=1.0.1.14
Cisco RV134W Firmware=1.0.1.20
Cisco RV134W Firmware
Cisco RV160W Firmware=1.0.0.14
Cisco RV160W Firmware=1.0.1.14
Cisco RV160W Firmware=1.0.1.20
Cisco RV160W Firmware
Cisco RV160W Firmware=1.0.0.14
Cisco RV160W Firmware=1.0.1.14
Cisco RV160W Firmware=1.0.1.20
Cisco RV160W Firmware
Cisco RV260 Firmware=1.0.0.14
Cisco RV260 Firmware=1.0.1.14
Cisco RV260 Firmware=1.0.1.20
Cisco RV260W
Cisco RV260P Firmware=1.0.0.14
Cisco RV260P Firmware=1.0.1.14
Cisco RV260P Firmware=1.0.1.20
Cisco RV260P Firmware
Cisco RV260W Firmware=1.0.0.14
Cisco RV260W Firmware=1.0.1.14
Cisco RV260W Firmware=1.0.1.20
Cisco RV260W Firmware
Cisco RV340W Firmware=1.0.0.14
Cisco RV340W Firmware=1.0.1.14
Cisco RV340W Firmware=1.0.1.20
Cisco RV340W Firmware
Cisco RV340W Firmware=1.0.0.14
Cisco RV340W Firmware=1.0.1.14
Cisco RV340W Firmware=1.0.1.20
Cisco RV340W Firmware
Cisco RV345 Firmware=1.0.0.14
Cisco RV345 Firmware=1.0.1.14
Cisco RV345 Firmware=1.0.1.20
Cisco RV345P Firmware
Cisco RV345P Firmware=1.0.0.14
Cisco RV345P Firmware=1.0.1.14
Cisco RV345P Firmware=1.0.1.20
Cisco RV345P Firmware

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-1309?

    CVE-2021-1309 is a vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business RV Series Routers.

  • What is the severity of CVE-2021-1309?

    The severity of CVE-2021-1309 is high with a CVSS score of 8.8.

  • How can an attacker exploit CVE-2021-1309?

    An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload.

  • Which Cisco routers are affected by CVE-2021-1309?

    Cisco Small Business RV Series Routers with specific firmware versions: 1.0.0.14, 1.0.1.14, and 1.0.1.20.

  • How can I fix CVE-2021-1309?

    Update the firmware of the affected Cisco Small Business RV Series Routers to a version that includes the necessary security patches.

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