Description
Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.
References6
- github.com/open62541/open62541/blob/master/doc/building.rst
- github.com/open62541/open62541/blob/master/src/server/ua_discov…
- github.com/open62541/open62541/blob/master/src/server/ua_servic…
- github.com/open62541/open62541/issues/8094
- github.com/open62541/open62541/tree/master/examples/discovery
- github.com/open62541/open62541/issues/8094
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 59 · as of 13 November 2026
- CWE
- CWE-120
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.