CVE-2021-27854
MEDIUMCVSS 4.7/10EPSS 0.66%
Last modified
CVE-2021-27854 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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.. EPSS estimates a 0.66% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ieee | Ieee 802.2 | <= 802.2h-1997 |
| Ietf | P802.1q | <= d1.0 |
References
- https://standards.ieee.org/ieee/802.1Q/10323/Vendor Advisory
- https://standards.ieee.org/ieee/802.2/1048/Vendor Advisory
- https://standards.ieee.org/ieee/802.1Q/10323/Vendor Advisory
- https://standards.ieee.org/ieee/802.2/1048/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27854?
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.
How severe is CVE-2021-27854?
CVE-2021-27854 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27854?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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Are you affected by CVE-2021-27854?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST