Medium severity · published Sep 15, 2026
CVE-2026-19641
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legit
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legitimate users being unable to log in to the device.
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:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% 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 4.36.0F; 4.35.0 through 4.35.5M; 4.34.0 through 4.34.7.1M; 0.0.0 through 4.33.8M · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19641
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19641
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/24708-security-advisory-0152
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