PT-2021-2539 · Cisco · Cisco Small Business Rv Series Routers

Qian Chen · Published 2021-04-07 · Updated 2022-08-05 · CVE-2021-1251

Positive Technologies (AI Summary)

CVSS v3.1

7.4

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Cisco Small Business RV Series Routers (affected versions not specified)

Description: The issue is related to the Link Layer Discovery Protocol (LLDP) implementation, which is a Layer 2 protocol. An unauthenticated, adjacent attacker could execute arbitrary code or cause an affected router to leak system memory or reload, resulting in a denial of service (DoS) condition. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). The vulnerability is also associated with incorrect memory release before removing the last reference, which could allow a remote attacker to cause a denial of service.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Memory Leak

Weakness Enumeration

CWE-119

CWE-401

Related Identifiers

BDU:2021-01945

CVE-2021-1251

Affected Products

Cisco Small Business Rv Series Routers

References · 6

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-rv-multi-lldp-u7e4chCe · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1251 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01945 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-1251 · Security Note
• https://cybersecurity-help.cz/vdb/SB2021040812 · Note
• https://t.me/cvenotify/12900 · Telegram Post