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Status published
Unknown
CVE-2021-27862
L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation
Vulnerability Description
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion (and optionally VLAN0 headers).
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Etienne Champetier (@champtar) <champetier.etienne@gmail.com>
References
More from IEEE
View All →CVE-2021-27861
L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths
Unknown
0
CVE-2021-27853
L2 network filtering can be bypassed using stacked VLAN0 and LLC/SNAP headers
Unknown
0
CVE-2017-13097
The P1735 IEEE standard describes flawed methods for encrypting electronic-design intellectual property (IP), including modification of Rights Block to remove or relax license requirement
High
7.8
CVE-2017-13096
The P1735 IEEE standard describes flawed methods for encrypting electronic-design intellectual property (IP), including modification of Rights Block to remove or relax access control
High
7.8
CVE-2017-13095
The P1735 IEEE standard describes flawed methods for encrypting electronic-design intellectual property (IP), including modification of a license-deny response to a license grant
High
7.8
Affected Vendor
IEEE
View all reports →Affected Software
802.2, draft-ietf-v6ops-ra-guard-08
Vulnerable Versions:
802.2h-1997, 08
Timeline
Official Publish:
September 27th, 2022
Last Modified:
November 4th, 2025
Added to House:
July 21st, 2026
CVSS Vectors
No vector data available