Medium severity · published Sep 16, 2026
CVE-2026-73436
On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.
6.5
CVSS
0.3%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.36.0F through 4.36.1F; 4.35.0F through 4.35.5M; 4.34.0F through 4.34.7.1M; 4.33.0F through 4.33.9M; 1.0.0 before 4.33.0F · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73436
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73436
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24727-security-advisory-0171
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