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prionPRIOn knowledge basePRION:CVE-2021-27862
HistorySep 27, 2022 - 7:15 p.m.

Design/Logic Flaw

2022-09-2719:15:00
PRIOn knowledge base
www.prio-n.com
11

4.7 Medium

CVSS3

Attack Vector

ADJACENT_NETWORK

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

4.9 Medium

AI Score

Confidence

High

3.3 Low

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:A/AC:L/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

18.2%

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).

CPENameOperatorVersion
ieee_802.2eq<= 802.2h-1997
p802.1qeq<= d1.0

Related

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f5 1
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cvelist
L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation
2022-09-27 00:00:00
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CVE-2021-27862
2022-10-02 16:19:07
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CVE-2021-27862
2022-09-27 19:15:00
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Security Advisory 0080
2023-09-28 00:00:00
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Vulnerabilities in Layer 2 Network Security Controls Affecting Cisco Products: September 2022
2022-09-27 16:00:00
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K45012151 : Layer 2 security bypass issue CVE-2021-27861, CVE-2021-27862, CVE-2021-27853, CVE-2021-27854
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cert
L2 network security controls can be bypassed using VLAN 0 stacking and/or 802.3 headers
2022-09-27 00:00:00

4.7 Medium

CVSS3

Attack Vector

ADJACENT_NETWORK

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

4.9 Medium

AI Score

Confidence

High

3.3 Low

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:A/AC:L/Au:N/C:N/I:P/A:N

0.001 Low

EPSS

Percentile

18.2%

JSON
Related for PRION:CVE-2021-27862
cvelist1redhatcve1cve1arista1cisco1f51cert1