Cisco Small Business RV Series Router Link Layer Discovery Protocol memory corruption

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6.0$0-$5k0.48

A vulnerability has been found in Cisco Small Business RV Series Router (Router Operating System) (the affected version is unknown) and classified as critical. This vulnerability affects an unknown code of the component Link Layer Discovery Protocol. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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).

The weakness was shared 04/08/2021 as cisco-sa-rv-multi-lldp-u7e4chCe. The advisory is shared for download at tools.cisco.com. This vulnerability was named CVE-2021-1309 since 11/13/2020. The exploitation appears to be easy. The attack needs to be initiated within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/11/2021).

Upgrading eliminates this vulnerability.

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VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

11/13/2020 CVE assigned
04/08/2021 +145 days Advisory disclosed
04/08/2021 +0 days VulDB entry created
04/11/2021 +3 days VulDB last update

Sourcesinfoedit

Vendor: https://www.cisco.com/

Advisory: cisco-sa-rv-multi-lldp-u7e4chCe
Status: Confirmed

CVE: CVE-2021-1309 (🔒)

Entryinfoedit

Created: 04/08/2021 10:20 AM
Updated: 04/11/2021 06:27 PM
Changes: (1) source_cve_cna
Complete: 🔍

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