Search/CVE-2021-27862
● CVE — Medium

CVE-2021-27862

Vendorieee, ietfProductieee 802.2, p802.1qDiscoveredSep 27, 2022UpdatedNov 4, 2025

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).

View graph Watch Export
CVSS v3.1
4.7 MEDIUM
EPSS
0.69%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Sep 25, 2026
▲ 0.05pp
0.64% → 0.69% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorADJACENT
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeCHANGED
ConfidentialityNONE
IntegrityLOW
AvailabilityNONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Connections
3 relationships
Timeline
disclosure → media coverage
Sep 27, 2022
Disclosure — published as a CVE record. · last revised by NVD Nov 4, 2025