{"id":"CVE-2025-62820","title":"Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.","summary":"Slack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.","severity":"medium","cvss":4.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L","cwe":["CWE-420"],"published":"2025-10-23","updated":"2026-10-08","sourceUpdated":"2026-10-08T11:10:00.250","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-62820","references":[{"url":"https://github.com/slackhq/nebula/pull/1493","label":"cve@mitre.org"},{"url":"https://github.com/slackhq/nebula/pull/1494","label":"cve@mitre.org"}],"tags":["nvd"],"epss":0.0022,"epssPercentile":0.11476,"ingestedAt":"2026-10-08T11:31:27.555Z","slug":"CVE-2025-62820","body":"## Overview\n\nSlack Nebula before 1.9.7 mishandles CIDR in some configurations and thus accepts arbitrary source IP addresses within the Nebula network.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":27,"depthScoreParts":{"impact":27,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}