{"id":"CVE-2026-77190","title":"On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent …","summary":"On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-20"],"vendor":"Arista Networks","product":"EOS","affected":["EOS >= 4.36.0F <= 4.36.1F","EOS >= 4.35.0F <= 4.35.5M","EOS >= 4.34.2F <= 4.34.7M"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:08:50.420","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77190","references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24733-security-advisory-0177","label":"psirt@arista.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-16T13:26:18.181290Z"},"ingestedAt":"2026-09-16T10:53:53.923Z","epss":0.00281,"epssPercentile":0.20825,"slug":"CVE-2026-77190","body":"## Overview\n\nOn affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}