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01 Record

CVE-2021-27862

L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation

MediumPUBLISHEDCNA: certcc
CNA base score4.7 CVSS v3.xCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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02 Description

L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.68% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 52.2% of scored records. A rank, not a probability.
NVD base score
4.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-09-27 18:40Z4 YR AGO
Last updated
2025-11-04 19:12Z11 MO AGO
Reserved
2021-03-01
Assigning CNA
certcc
Record state
PUBLISHED
Severity
Medium (CVSS 4.7)
CNA CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weaknesses
  • CWE-130Improper Handling of Length Parameter InconsistencyBase
  • CWE-290Authentication Bypass by SpoofingBase
Data version
5.2
Document digest
a1ad985d71ddf167df8af1a8762bfda0c22d3cd67be6e5d7da99b5df5522d040

05 Affected products

VendorProductVersionsPlatforms
IEEE802.2802.2h-1997 to 802.2h-1997—
IETFdraft-ietf-v6ops-ra-guard-0808 to 08—

06 References