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[email protected]CVE-2021-27862

HistorySep 27, 2022 - 7:15 p.m.

CVE-2021-27862

2022-09-2719:15:09

CWE-130

CWE-290

[email protected]

web.nvd.nist.gov

cve-2021-27862

layer 2

network filtering

ipv6

ra guard

bypass

llc

snap headers

ethernet

wifi

vlan0

4.7 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

4.7 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

32.3%

JSON

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).

Affected configurations

NVD

Node

ieeeieee_802.2Range≤802.2h-1997

Node

ietfp802.1qRange≤d1.0

CPENameOperatorVersion
ieee:ieee_802.2ieee ieee 802.2le802.2h-1997

CPE	Name	Operator	Version
ieee:ieee_802.2	ieee ieee 802.2	le	802.2h-1997

CNA Affected

[
  {
    "vendor": "IEEE",
    "product": "802.2",
    "versions": [
      {
        "version": "802.2h-1997",
        "status": "affected",
        "lessThanOrEqual": "802.2h-1997",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "IETF",
    "product": "draft-ietf-v6ops-ra-guard-08",
    "versions": [
      {
        "version": "08",
        "status": "affected",
        "lessThanOrEqual": "08",
        "versionType": "custom"
      }
    ]
  }
]