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I. Basic Information for CVE-2021-27853
Vulnerability Information

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Vulnerability Title
L2 network filtering can be bypassed using stacked VLAN0 and LLC/SNAP headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用欺骗进行的认证绕过
Source: NVD (National Vulnerability Database)
Vulnerability Title
多款Cisco产品安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS等都是美国思科(Cisco)公司的产品。Cisco IOS是一套为其网络设备开发的操作系统。Cisco IOS XE Software是一个操作系统。Cisco Small Business是一个交换机。 Cisco IOS Software - Switches、Cisco IOS XE Software - Switches、Cisco IOS XE Software - Routers、Cisco IOS XR Software、Cisco Meraki - Switches、Ci
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
IEEE802.2 802.2h-1997 ~ 802.2h-1997 -
IETFdraft-ietf-v6ops-ra-guard 08 ~ 08 -
IETFP802.1Q D1.0 ~ D1.0 -
II. Public POCs for CVE-2021-27853
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III. Intelligence Information for CVE-2021-27853
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IV. Related Vulnerabilities
V. Comments for CVE-2021-27853

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