Vulnerability · Published Sep 11, 2026 · Assigned by Bull
CVE-2025-15679BMC root account active without password on BullSequana XH3406 and XH3515
High 7.3
In plain English
A high-severity security flaw in BullSequana XH3406 from Bull. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 4.0)7.3High
Exploit odds (30 days)0.2%top 95.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Under certain circumstances such as reset to factory default operation, the BMC root account is made active without a password on BullSequana XH3406 and XH3515.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Bull | BullSequana XH3406 | 0 – before TS 04.05 |
| Bull | BullSequana XH3515 | 0 – before TS 43.01 |
Weakness: CWE-258 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:P/S:P/AU:N/R:U/V:C/RE:L/U:Clear