{"id":"CVE-2026-66349","title":"The MMS server connection handler contains a flaw in its processing of \nBER-encoded request data","summary":"The MMS server connection handler contains a flaw in its processing of \nBER-encoded request data. When an MMS confirmed request PDU containing \nan extended BER tag is received over an established session, the decoder\n may advance its int…","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-125"],"published":"2026-07-30","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:30:43.093","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-66349","references":[{"url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-10.json","label":"ics-cert@hq.dhs.gov"},{"url":"https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-10","label":"ics-cert@hq.dhs.gov"}],"tags":["nvd"],"epss":0.00181,"epssPercentile":0.07916,"ingestedAt":"2026-09-08T20:10:03.155Z","slug":"CVE-2026-66349","body":"## Overview\n\nThe MMS server connection handler contains a flaw in its processing of \nBER-encoded request data. When an MMS confirmed request PDU containing \nan extended BER tag is received over an established session, the decoder\n may advance its internal buffer incorrectly due to a missing bounds \ncheck. This results in a one byte heap out-of-bounds read and causes the\n MMS service process to terminate, leading to a denial-of-service \ncondition.\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,"exploitation":0,"ransomware":0},"changes":[]}