vulnerability
Cisco IOS: CVE-2021-27853: Vulnerabilities in Layer 2 Network Security Controls Affecting Cisco Products: September 2022
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 3 | (AV:A/AC:L/Au:N/C:N/I:P/A:N) | Sep 27, 2022 | Jan 21, 2026 | Jan 21, 2026 |
Severity
3
CVSS
(AV:A/AC:L/Au:N/C:N/I:P/A:N)
Published
Sep 27, 2022
Added
Jan 21, 2026
Modified
Jan 21, 2026
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.
Solution
cisco-ios-upgrade-latest
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