Executive Summary

Informations
Name CVE-2021-27853 First vendor Publication 2022-09-27
Vendor Cve Last vendor Modification 2022-11-16

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Overall CVSS Score 4.7
Base Score 4.7 Environmental Score 4.7
impact SubScore 1.4 Temporal Score 4.7
Exploitabality Sub Score 2.8
 
Attack Vector Adjacent Attack Complexity Low
Privileges Required None User Interaction None
Scope Changed Confidentiality Impact None
Integrity Impact Low Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27853

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-290 Authentication Bypass by Spoofing

Sources (Detail)

Source Url
CISCO https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-s...
CONFIRM https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
https://standards.ieee.org/ieee/802.1Q/10323/
https://standards.ieee.org/ieee/802.2/1048/
MISC https://blog.champtar.fr/VLAN0_LLC_SNAP/
https://kb.cert.org/vuls/id/855201

Alert History

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Date Informations
2022-11-16 21:27:27
  • Multiple Updates
2022-10-27 21:27:24
  • Multiple Updates
2022-10-12 17:27:18
  • Multiple Updates
2022-10-04 00:27:11
  • Multiple Updates
2022-09-28 05:27:11
  • Multiple Updates
2022-09-28 00:27:12
  • First insertion