Medium severity · published Sep 16, 2026
CVE-2026-73469
When specific platforms are using Arista EOS with a loose Unicast Reverse Path Forwarding (uRPF) configuration, certain traffic may not be subjected to the intended verification drop
5.8
CVSS
0.3%
EPSS
No
On KEV
Description
When specific platforms are using Arista EOS with a loose Unicast Reverse Path Forwarding (uRPF) configuration, certain traffic may not be subjected to the intended verification drop. Consequently, traffic that should be dropped based on these routes could still be processed and forwarded by the device.
This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.35.0F through 4.35.4M · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73469
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73469
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24732-security-advisory-0176
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