CVE-2015-7856
HighSummary
OpenNMS has a default password of 'rtc' for the rtc account, which makes it easier for remote attackers to obtain access by leveraging knowledge of the credentials.
Risk Assessment
The default password increases the risk of unauthorized access to the system, potentially leading to serious security breaches.
Recommendation
It is recommended to change the default password to a strong and unique password for the rtc account to minimize the risk of attacks.
Other vulnerabilities in OpenNMS
See all- CVE-2026-19182Medium
An incorrect authorization check in the v2 Alarm REST API in OpenNMS Meridian and Horizon allows a low-privileged authenticated user (ROLE_REST) to acknowledge, escalate, or clear alarms recorded as an arbitrary username, and, when also assigned ROLE_READONLY, to modify alarm state despite the read-only restriction. A credential check is guarded by an inverted condition, so it never executes for a real (non-blank) username.
- CVE-2026-19135Medium
A JEXL expression sandbox bypass exists in multiple versions of OpenNMS Meridian and Horizon. A low-privileged authenticated user can submit a crafted expression to the Measurements REST API that escapes the sandbox and loads arbitrary Java classes on the server. This can potentially allow an attacker to gain access to confidential information and compromise integrity.
Original NVD description (English source)
OpenNMS has a default password of rtc for the rtc account, which makes it easier for remote attackers to obtain access by leveraging knowledge of the credentials.