Medium severity · published Sep 15, 2026
CVE-2026-73460
On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure
6.1
CVSS
0.2%
EPSS
No
On KEV
Description
On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% 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 4.36.1F · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73460
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73460
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160
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