Firmware update for MES23XX, MES33XX, MES2328I, MES35XX, MES5324. Version 4.0.26

MES
26 December 2025

Firmware update

Firmware Version: 4.0.26

The firmware and detailed description of the product capabilities are available in the Downloads or on the product page.

Added

  • Added the ability to assign a Native VLAN in Dot1x if the RADIUS server is not available;
  • Added the ability to configure monitoring of the RADIUS server status;
  • Added the option to select a port for the HTTPS server;
  • Added the ability to specify the source interface for FTP when copying files;
  • Added support for MSTP and GVRP collaboration.

Fixed

  • Fixed an error that led to the client's refusal to reauthorize after applying the CoA;
  • Fixed an error that caused the device to reboot when reauthorizing a client using dACL obtained by CoA;
  • Fixed an error that caused traffic loss when IP SG and Dot1x were working together;
  • Fixed an error that caused routing to fail between IP unnumbered interfaces;
  • Fixed a vulnerability that allowed a MITM attack to be carried out when the VerifyHostKeyDNS option was enabled in OpenSSH;
  • Fixed an error that caused the backup device's power supply states to be displayed incorrectly in the stack;
  • Fixed incorrect operation of the DHCP Relay in conjunction with PBR;
  • Fixed incorrect operation of the DHCP Relay in conjunction with DHCP Snooping within the same VLAN;
  • Fixed an error that caused BPDU sending to malfunction when changing STP mode with NSF enabled;
  • Fixed an error that caused the device to reboot when changing the STP mode in the stack;
  • Fixed an error that caused the device to reboot when the bridge multicast unregistered filtering counter overflowed.
  • Fixed Root Bridge loss in RPVST after inactive port configuration;
  • Fixed an error when getting more than 20 characters in the Class attribute of the RADIUS protocol;
  • Fixed a file transfer error using the SCP protocol;
  • Fixed an error when uploading a large configuration file during ZTP;
  • Fixed an error where the MAC address was not examined after passing Dot1x authorization.;
  • Fixed an error in the stack that caused the device to reboot when transferring skills;
  • Fixed the incorrect output of thermal sensor readings.

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