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Medium severity4.7NVD Advisory· Published Sep 27, 2022· Updated Jun 17, 2026

CVE-2021-27854

CVE-2021-27854

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

5
  • Ieee/Ieee 802.2
    cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*
    Range: <=802.2h-1997
  • Ietf/P802.1q2 versions
    cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*range: <=d1.0
    • (no CPE)range: D1.0
  • IEEE/802.2v5
    Range: 802.2h-1997
  • IETF/draft-ietf-v6ops-ra-guardv5
    Range: 08

Patches

Vulnerability mechanics

References

6

News mentions

0

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