CVE-2021-43116: An Access Control vulnerability exists in Nacos 2.0.3 in the access prompt page; enter username and passwor...

Security readout for executives and security teams

CVE-2021-43116 describes an access-control flaw in Nacos 2.0.3 that may allow a malicious user to log in by tampering with the login response flow. For executives, the concern is unauthorized access to a service-management platform. The source bundle does not provide CVSS, a vendor fix version, or confirmed active exploitation. Exposure is most likely where Nacos 2.0.3 is deployed, especially if the Nacos console or login surface is reachable from untrusted networks. The source bundle does not identify other affected versions or products. Treat as priority remediation if Nacos 2.0.3 is present or externally reachable. Unauthorized access to Nacos could affect service configuration and operational control. If Nacos is not used, business exposure is unlikely. Mitigation focus: Identify any Nacos 2.0.3 deployments in production, staging, and development environments.; Restrict Nacos console access to trusted networks or VPN users only.; Check Alibaba Nacos guidance for the supported fixed version or workaround..

Prepared

Jun 2, 2026, 02:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.