{"id":"CVE-2026-67856","published":"2026-08-04T22:17:15.850","lastModified":"2026-08-05T19:17:32.880","description":"An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service via crafted CreateSubscription, CreateMonitoredItems(Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions requests","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-400"],"vendors":[],"products":[],"references":[{"url":"https://github.com/open62541/open62541/blob/master/examples/access_control/server_access_control.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.h","tags":[]},{"url":"https://github.com/open62541/open62541/issues/8092","tags":[]},{"url":"https://github.com/open62541/open62541/issues/8092","tags":[]}],"exploitRefs":[{"url":"https://github.com/open62541/open62541/blob/master/examples/access_control/server_access_control.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.c","tags":[]},{"url":"https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.h","tags":[]},{"url":"https://github.com/open62541/open62541/issues/8092","tags":[]},{"url":"https://github.com/open62541/open62541/issues/8092","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows remote attackers to cause a denial of service by sending crafted requests, impacting availability.","exploitability":"Exploitation requires sending specific types of requests; preconditions include access to the affected open62541 implementation.","blast_radius":"If exploited, it could lead to system unavailability for all users, affecting operations relying on the service.","remediation":"Update to a patched version of open62541 or apply vendor-provided patches immediately.","tags":["dos","ics","remote"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-08-11T06:55:18.745Z"}}