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    CVE-2021-28511

    This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.

    Published:Aug 5, 2022
    Last Modified:Jun 2, 2026
    EPS:Aug 5, 2022
    EPSS Score:0.00232
    CVSS Score:5.8

    Affected Products

    Vendor
    Arista
    Product
    7050cx3-32s
    Vendor
    Arista
    Product
    7050cx3m-32s
    Vendor
    Arista
    Product
    7050sx3-48c8
    Vendor
    Arista
    Product
    7050sx3-48yc
    Vendor
    Arista
    Product
    7050sx3-48yc12
    Vendor
    Arista
    Product
    7050sx3-48yc8
    Vendor
    Arista
    Product
    7050sx3-96yc8
    Vendor
    Arista
    Product
    7050tx3-48c8
    Vendor
    Arista
    Product
    720xp-24y6
    Vendor
    Arista
    Product
    720xp-24zy4
    Vendor
    Arista
    Product
    720xp-48y6
    Vendor
    Arista
    Product
    720xp-48zc2
    Vendor
    Arista
    Product
    720xp-96zc2
    Vendor
    Arista
    Product
    7300x3-32c
    Vendor
    Arista
    Product
    7300x3-48yc4
    Vendor
    Arista
    Product
    Eos

    Exploits

    https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078https://www.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    Related CVEs

    CVE-2023-24510 (CVSS 7.5) — On the affected platforms running EOS, a malformed DHCP packet might cause the DHCP relay agent to restart.…
    CVE-2023-24512 (CVSS 8.8) — On affected platforms running Arista EOS, an authorized attacker with permissions to perform gNMI requests cou…
    CVE-2023-24511 (CVSS 5.3) — On affected platforms running Arista EOS with SNMP configured, a specially crafted packet can cause a memory l…
    CVE-2021-28510 (CVSS 5.3) — For certain systems running EOS, a Precision Time Protocol (PTP) packet of a management/signaling message with…
    CVE-2021-28509 (CVSS 6.1) — This advisory documents the impact of an internally found vulnerability in Arista EOS state streaming telemetr…
    CVE-2021-28508 (CVSS 6.8) — This advisory documents the impact of an internally found vulnerability in Arista EOS state streaming telemetr…
    CVE-2020-15898 (CVSS 5.3) — In Arista EOS malformed packets can be incorrectly forwarded across VLAN boundaries in one direction. This vul…
    CVE-2020-26569 (CVSS 5.9) — In EVPN VxLAN setups in Arista EOS, specific malformed packets can lead to incorrect MAC to IP bindings and as…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High