CVSS 3.1
4.7 mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:NCVE-2021-27853
Medium (4.7) in cisco. EPSS 0.8% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
- CWE
- CWE-290
- Published
- Modified
- Record from
- the NVD, synced
Affected
- cisco:catalyst_6503-e_firmware
- cisco:catalyst_6504-e_firmware
- cisco:catalyst_6506-e_firmware
- cisco:catalyst_6509-e_firmware
- cisco:catalyst_6509-neb-a_firmware
- cisco:catalyst_6509-v-e_firmware
- cisco:catalyst_6513-e_firmware
- cisco:catalyst_6800ia_firmware
- cisco:catalyst_6807-xl_firmware
- cisco:catalyst_6840-x_firmware
- cisco:catalyst_6880-x_firmware
- cisco:catalyst_c6816-x-le_firmware
- cisco:catalyst_c6824-x-le-40g_firmware
- cisco:catalyst_c6832-x-le_firmware
- cisco:catalyst_c6840-x-le-40g_firmware
- cisco:ios_xe
- cisco:meraki_ms210_firmware
- cisco:meraki_ms225_firmware
- cisco:meraki_ms250_firmware
- cisco:meraki_ms350_firmware
- cisco:meraki_ms355_firmware
- cisco:meraki_ms390_firmware
- cisco:meraki_ms410_firmware
- cisco:meraki_ms420_firmware
- cisco:meraki_ms425_firmware
- cisco:meraki_ms450_firmware
- cisco:n9k-c9316d-gx_firmware
- cisco:n9k-c9332d-gx2b_firmware
- cisco:n9k-c9348d-gx2a_firmware
- cisco:n9k-c93600cd-gx_firmware
- cisco:n9k-c9364d-gx2a_firmware
- cisco:n9k-x9432c-s_firmware
- cisco:n9k-x9464px_firmware
- cisco:n9k-x9464tx2_firmware
- cisco:n9k-x9564px_firmware
- cisco:n9k-x9564tx_firmware
- cisco:n9k-x9636c-r_firmware
- cisco:n9k-x9636c-rx_firmware
- cisco:n9k-x97160yc-ex_firmware
- cisco:n9k-x9732c-ex_firmware
- cisco:n9k-x9732c-fx_firmware
- cisco:n9k-x9736c-ex_firmware
- cisco:n9k-x9736c-fx_firmware
- cisco:n9k-x9788tc-fx_firmware
- cisco:nexus_92160yc-x_firmware
- cisco:nexus_92300yc_firmware
- cisco:nexus_92304qc_firmware
- cisco:nexus_92348gc-x_firmware
- cisco:nexus_9236c_firmware
- cisco:nexus_9272q_firmware