CVE-2021-27854

2022-09-2719:15:09

CWE-290

[email protected]

web.nvd.nist.gov

cve-2021-27854

network filtering

vlan

security bypass

nvd

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

40.9%

JSON

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.

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": "IETF",
    "product": "P802.1Q",
    "versions": [
      {
        "version": "D1.0",
        "status": "affected",
        "lessThanOrEqual": "D1.0",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "IETF",
    "product": "draft-ietf-v6ops-ra-guard",
    "versions": [
      {
        "version": "08",
        "status": "affected",
        "lessThanOrEqual": "08",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "IEEE",
    "product": "802.2",
    "versions": [
      {
        "version": "802.2h-1997",
        "status": "affected",
        "lessThanOrEqual": "802.2h-1997",
        "versionType": "custom"
      }
    ]
  }
]