CVE-2026-67858: n/a
A buffer overflow vulnerability exists in open62541 version 1.5.5 when the Local Discovery Server (LDS) is configured with multicast discovery enabled via the MDNSD backend. An unauthenticated remote attacker can exploit this by sending a RegisterServer or RegisterServer2 request with many unique discoveryUrls, leading to a denial of service condition.
AI Analysis
Technical Summary
CVE-2026-67858 describes a buffer overflow in open62541 1.5.5's Local Discovery Server component when multicast discovery is enabled using the MDNSD backend. The vulnerability is triggered by an unauthenticated remote attacker sending RegisterServer or RegisterServer2 requests containing numerous unique discoveryUrls, causing a denial of service. The CVSS 3.1 base score is 7.5 (high severity) with network attack vector, low attack complexity, no privileges required, and no user interaction needed. There is no known patch or official remediation published at this time.
Potential Impact
The vulnerability allows unauthenticated remote attackers to cause a denial of service by exploiting a buffer overflow in the Local Discovery Server's multicast discovery feature. This can disrupt service availability but does not impact confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling multicast discovery or restricting access to the Local Discovery Server to trusted networks to reduce exposure.
CVE-2026-67858: n/a
Description
A buffer overflow vulnerability exists in open62541 version 1.5.5 when the Local Discovery Server (LDS) is configured with multicast discovery enabled via the MDNSD backend. An unauthenticated remote attacker can exploit this by sending a RegisterServer or RegisterServer2 request with many unique discoveryUrls, leading to a denial of service condition.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67858 describes a buffer overflow in open62541 1.5.5's Local Discovery Server component when multicast discovery is enabled using the MDNSD backend. The vulnerability is triggered by an unauthenticated remote attacker sending RegisterServer or RegisterServer2 requests containing numerous unique discoveryUrls, causing a denial of service. The CVSS 3.1 base score is 7.5 (high severity) with network attack vector, low attack complexity, no privileges required, and no user interaction needed. There is no known patch or official remediation published at this time.
Potential Impact
The vulnerability allows unauthenticated remote attackers to cause a denial of service by exploiting a buffer overflow in the Local Discovery Server's multicast discovery feature. This can disrupt service availability but does not impact confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider disabling multicast discovery or restricting access to the Local Discovery Server to trusted networks to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-30T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a725cbabf8831d5398274e2
Added to database: 08/04/2026, 21:42:18 UTC
Last enriched: 08/12/2026, 15:49:37 UTC
Last updated: 09/18/2026, 02:32:36 UTC
Views: 60
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