Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Adjacent_network
0

CVE-2021-27853

Disclosure Date: September 27, 2022 •
CVE-2021-27853 CVSS v3 Base Score: 4.7
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers.

Add Assessment

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CVSS V3 Severity and Metrics
Base Score:
4.7 Medium
Impact Score:
1.4
Exploitability Score:
2.8
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector (AV):
Adjacent_network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Changed
Confidentiality (C):
None
Integrity (I):
Low
Availability (A):
None

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
802.2 802.2h-1997
draft-ietf-v6ops-ra-guard 08
P802.1Q D1.0
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • cisco,
  • ieee,
  • ietf

Products

  • catalyst 6503-e firmware 15.5(01.01.85)sy07,
  • catalyst 6504-e firmware 15.5(01.01.85)sy07,
  • catalyst 6506-e firmware 15.5(01.01.85)sy07,
  • catalyst 6509-e firmware 15.5(01.01.85)sy07,
  • catalyst 6509-neb-a firmware 15.5(01.01.85)sy07,
  • catalyst 6509-v-e firmware 15.5(01.01.85)sy07,
  • catalyst 6513-e firmware 15.5(01.01.85)sy07,
  • catalyst 6800ia firmware 15.5(01.01.85)sy07,
  • catalyst 6807-xl firmware 15.5(01.01.85)sy07,
  • catalyst 6840-x firmware 15.5(01.01.85)sy07,
  • catalyst 6880-x firmware 15.5(01.01.85)sy07,
  • catalyst c6816-x-le firmware 15.5(01.01.85)sy07,
  • catalyst c6824-x-le-40g firmware 15.5(01.01.85)sy07,
  • catalyst c6832-x-le firmware 15.5(01.01.85)sy07,
  • catalyst c6840-x-le-40g firmware 15.5(01.01.85)sy07,
  • ieee 802.2,
  • ios xe 15.2(07)e02,
  • ios xe 15.2(07)e03,
  • ios xe 17.3.3,
  • ios xe 17.4.1,
  • ios xe 17.6.1,
  • meraki ms210 firmware -,
  • meraki ms225 firmware -,
  • meraki ms250 firmware -,
  • meraki ms350 firmware -,
  • meraki ms355 firmware -,
  • meraki ms390 firmware -,
  • meraki ms410 firmware -,
  • meraki ms420 firmware -,
  • meraki ms425 firmware -,
  • meraki ms450 firmware -,
  • n9k-c9316d-gx firmware 9.3(5),
  • n9k-c9332d-gx2b firmware 9.3(5),
  • n9k-c9348d-gx2a firmware 9.3(5),
  • n9k-c93600cd-gx firmware 9.3(5),
  • n9k-c9364d-gx2a firmware 9.3(5),
  • n9k-x9432c-s firmware 9.3(5),
  • n9k-x9464px firmware 9.3(5),
  • n9k-x9464tx2 firmware 9.3(5),
  • n9k-x9564px firmware 9.3(5),
  • n9k-x9564tx firmware 9.3(5),
  • n9k-x9636c-r firmware 9.3(5),
  • n9k-x9636c-rx firmware 9.3(5),
  • n9k-x97160yc-ex firmware 9.3(5),
  • n9k-x9732c-ex firmware 9.3(5),
  • n9k-x9732c-fx firmware 9.3(5),
  • n9k-x9736c-ex firmware 9.3(5),
  • n9k-x9736c-fx firmware 9.3(5),
  • n9k-x9788tc-fx firmware 9.3(5),
  • nexus 92160yc-x firmware 9.3(5),
  • nexus 92300yc firmware 9.3(5),
  • nexus 92304qc firmware 9.3(5),
  • nexus 92348gc-x firmware 9.3(5),
  • nexus 9236c firmware 9.3(5),
  • nexus 9272q firmware 9.3(5),
  • nexus 93108tc-ex firmware 9.3(5),
  • nexus 93108tc-fx firmware 9.3(5),
  • nexus 93108tc-fx3p firmware 9.3(5),
  • nexus 93120tx firmware 9.3(5),
  • nexus 93180yc-ex firmware 9.3(5),
  • nexus 93180yc-fx firmware 9.3(5),
  • nexus 93180yc-fx3 firmware 9.3(5),
  • nexus 93216tc-fx2 firmware 9.3(5),
  • nexus 93240yc-fx2 firmware 9.3(5),
  • nexus 9332c firmware 9.3(5),
  • nexus 93360yc-fx2 firmware 9.3(5),
  • nexus 9336c-fx2 firmware 9.3(5),
  • nexus 9336c-fx2-e firmware 9.3(5),
  • nexus 9348gc-fxp firmware 9.3(5),
  • nexus 9364c firmware 9.3(5),
  • nexus 9364c-gx firmware 9.3(5),
  • nexus 9432pq firmware 9.3(5),
  • nexus 9504 firmware 9.3(5),
  • nexus 9508 firmware 9.3(5),
  • nexus 9516 firmware 9.3(5),
  • nexus 9536pq firmware 9.3(5),
  • nexus 9636pq firmware 9.3(5),
  • nexus 9716d-gx firmware 9.3(5),
  • nexus 9736pq firmware 9.3(5),
  • nexus 9800 firmware 9.3(5),
  • nexus x9636q-r firmware 9.3(5),
  • p802.1q,
  • sf-500-24mp firmware 3.0.0.61,
  • sf500-18p firmware 3.0.0.61,
  • sf500-24 firmware 3.0.0.61,
  • sf500-24p firmware 3.0.0.61,
  • sf500-48 firmware 3.0.0.61,
  • sf500-48mp firmware 3.0.0.61,
  • sg500-28 firmware 3.0.0.61,
  • sg500-28mpp firmware 3.0.0.61,
  • sg500-28p firmware 3.0.0.61,
  • sg500-52 firmware 3.0.0.61,
  • sg500-52mp firmware 3.0.0.61,
  • sg500-52p firmware 3.0.0.61,
  • sg500x-24 firmware 3.0.0.61,
  • sg500x-24mpp firmware 3.0.0.61,
  • sg500x-24p firmware 3.0.0.61,
  • sg500x-48 firmware 3.0.0.61,
  • sg500x-48mpp firmware 3.0.0.61,
  • sg500x-48p firmware 3.0.0.61
Technical Analysis