{"id":"CVE-2018-25221","title":"EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter","summary":"EChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a m…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"Echatserver","product":"EChat Server","affected":["echat_server 3.1"],"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-03-30T15:52:00.583702Z"},"exploitAvailable":true,"published":"2026-03-28","updated":"2026-10-01","sourceUpdated":"2026-10-01T15:19:09.212Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2018-25221","references":[{"url":"https://www.exploit-db.com/exploits/44155","label":"ExploitDB-44155"},{"url":"https://www.vulncheck.com/advisories/echat-server-buffer-overflow-via-chat-ghp-username-parameter","label":"VulnCheck Advisory: EChat Server 3.1 Buffer Overflow via chat.ghp username Parameter"}],"tags":["cve.org","exploit-available"],"epss":0.00822,"epssPercentile":0.55743,"ingestedAt":"2026-10-01T15:48:17.889Z","slug":"CVE-2018-25221","body":"## Overview\n\nEChat Server 3.1 contains a buffer overflow vulnerability in the chat.ghp endpoint that allows remote attackers to execute arbitrary code by supplying an oversized username parameter. Attackers can send a GET request to chat.ghp with a malicious username value containing shellcode and ROP gadgets to achieve code execution in the application context.\n\n## Affected\n\n- `echat_server 3.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[]}