CVE-2021-27854

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.

CVSS v3.0 4.7 MEDIUM

4.7^/10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://standards.ieee.org/ieee/802.2/1048/	Vendor Advisory
https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/	Vendor Advisory
https://standards.ieee.org/ieee/802.1Q/10323/	Vendor Advisory
https://kb.cert.org/vuls/id/855201
https://blog.champtar.fr/VLAN0_LLC_SNAP/

Configurations

Configuration 1 (hide)

cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*

Information

Published : 2022-09-27 12:15

Updated : 2022-10-12 06:15

NVD link : CVE-2021-27854

Mitre link : CVE-2021-27854

JSON object : View

CWE

CWE-290

Authentication Bypass by Spoofing

Products Affected

ieee

ieee_802.2

ietf

p802.1q

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://standards.ieee.org/ieee/802.2/1048/", "name": "N/A", "tags": ["Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/", "name": "N/A", "tags": ["Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "https://standards.ieee.org/ieee/802.1Q/10323/", "name": "N/A", "tags": ["Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "https://kb.cert.org/vuls/id/855201", "name": "https://kb.cert.org/vuls/id/855201", "tags": [], "refsource": "MISC"}, {"url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/", "name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/", "tags": [], "refsource": "MISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-290"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-27854", "ASSIGNER": "cert@cert.org"}}, "impact": {"baseMetricV3": {"cvssV3": {"scope": "CHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "ADJACENT_NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 2.8}}, "publishedDate": "2022-09-27T19:15Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "802.2h-1997"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "d1.0"}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2022-10-12T13:15Z"}

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