Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-27854— L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation

Quick assessment

Affected
IETF P802.1Q
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 XR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 IOS Software - Switches、Cisco IOS XE Software - Switches、Cisco IOS XE Software - Routers、Cisco IOS XR Software、Cisco Meraki - Switches、

AI Predicted 5.3 Difficulty: Moderate EPSS 0.71% · P52
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-27854

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation
Source: CVE Program / CVE List V5
Vulnerability Description
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using combinations of VLAN 0 headers, LLC/SNAP headers, and converting frames from Ethernet to Wifi and its reverse.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
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 XR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 IOS Software - Switches、Cisco IOS XE Software - Switches、Cisco IOS XE Software - Routers、Cisco IOS XR Software、Cisco Meraki - Switches、
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

Vendor Product Affected Versions CPE Subscribe
IETF P802.1Q D1.0 ~ D1.0 -
IETF draft-ietf-v6ops-ra-guard 08 ~ 08 -
IEEE 802.2 802.2h-1997 ~ 802.2h-1997 -

II. Public POCs for CVE-2021-27854

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-27854

请登录查看更多情报信息。

Vendor Advisories for CVE-2021-27854 (1)

Security Blog Posts for CVE-2021-27854 (1)

Other References for CVE-2021-27854 (3)

IV. Related Vulnerabilities

Same vendor: IETF
Same weakness: CWE-290

V. Comments for CVE-2021-27854

No comments yet

Leave a comment