Medium severity · published Sep 15, 2026
CVE-2026-73451
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVI) in shared mode, restarting of the secondary switchcard forwarding agent or insertion of secondary switchcard, can cause security ACLs on shared SVIs to stop functioning. This may result in incorrect packet permit/deny behavior.
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.36.0 through 4.36.0.1F; 4.35.0 through 4.35.4M; 4.34.0 through 4.34.6M; 4.33.0 through 4.33.8M; 4.32.0 through 4.32.11M; 4.31.1F through 4.31.10M · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73451
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73451
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24707-security-advisory-0151
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