CVE-2026-3820: Supermicro BMC command injection in SMTP service

CVE-2026-3820 · Severity: high · CVSS 7.2 · Published 2026-06-04

A vulnerability exists in the management controller (BMC) of certain Supermicro servers, which is the component used for remote hardware monitoring and maintenance. An attacker with administrative access can exploit the email notification settings to run unauthorized commands on the controller. This could lead to a complete takeover of the server management system, permanent hardware compromise, or a total service outage.

Quick answers

Is CVE-2026-3820 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-3820 being exploited in the wild.
How severe is CVE-2026-3820?
High severity, with a CVSS score of 7.2, published 4 June 2026.
Which products and versions are affected?
Supermicro AS-2115HS-TNR BMC Firmware; Supermicro MBD-X14DBM-AP BMC Firmware Before 01.07.00.11; Supermicro MBD-BH4SRG BMC Firmware Before 01.08.11; Supermicro MBD-B4SA1-CPU BMC Firmware Before 01.08.11; and 20 more.
Is there a fix for CVE-2026-3820?
A patch was published on 2026-06-04: Fixed firmware versions released for various motherboard models. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-3820 attacked?
It is attacked over the network, in device firmware.
Am I affected by CVE-2026-3820?
Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This vulnerability is classified as an OS Command Injection (CWE-78) within the SMTP service configuration of the Supermicro Baseboard Management Controller (BMC) firmware. An attacker who has already obtained administrator-level privileges can inject specially crafted characters into the SMTP configuration fields. These characters are improperly neutralized, leading to the execution of unintended system commands during process invocation. Successful exploitation allows for arbitrary code execution, denial-of-service, or permanent compromise of the BMC. The attack is reachable over the network but requires high privileges (PR:H). Supermicro has released updated firmware versions for affected motherboard models to mitigate this issue.

Affected products

  • Supermicro AS-2115HS-TNR BMC Firmware
  • Supermicro MBD-X14DBM-AP BMC Firmware Before 01.07.00.11
  • Supermicro MBD-BH4SRG BMC Firmware Before 01.08.11
  • Supermicro MBD-B4SA1-CPU BMC Firmware Before 01.08.11
  • Supermicro MBD-B4SC1-CPU BMC Firmware Before 01.08.11
  • Supermicro MBD-X14SBGM BMC Firmware Before 01.06.00.11
  • Supermicro MBD-X14DBG-MAP BMC Firmware Before 01.06.00.11
  • Supermicro MBD-G2DMH-GI BMC Firmware Before 01.06.00.11
  • Supermicro MBD-B3SD1-20C-25G BMC Firmware Before 01.11.11
  • Supermicro MBD-X14SBHM BMC Firmware Before 01.06.00.11
  • Supermicro MBD-B14DBE BMC Firmware Before 01.06.00.11
  • Supermicro MBD-B14SBE-CPU-25G BMC Firmware Before 01.06.00.11
  • Supermicro MBD-B14DBT BMC Firmware Before 01.06.00.11
  • Supermicro MBD-X14DBG-GD BMC Firmware Before 01.06.00.11
  • Supermicro MBD-X14DBG-XAP BMC Firmware Before 01.06.00.11
  • Supermicro MBD-X14SBT-GAP BMC Firmware Before 01.06.00.11
  • Supermicro MBD-X14SBT-G BMC Firmware Before 01.06.00.11
  • Supermicro MBD-H14DST-F BMC Firmware Before 01.07.00.11
  • Supermicro MBD-H14DST-FL BMC Firmware Before 01.07.00.11
  • Supermicro MBD-X14DBG-LC+ BMC Firmware Before 01.07.00.11
  • Supermicro MBD-X14DBG-LC BMC Firmware Before 01.07.00.11
  • Supermicro MBD-H14DSG-OD BMC Firmware Before 01.07.00.11
  • Supermicro MBD-H14DSG-OM BMC Firmware Before 01.07.00.11
  • Supermicro MBD-B14SBE-CPU-AP BMC Firmware Before 01.06.00.11

Timeline

  • 2026-06-04: disclosed
  • 2026-06-04: advisory
  • 2026-06-04: patched: Fixed firmware versions released for various motherboard models.

References

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