Release Date:
November 12, 2026

Enhancements:

• Added the spanning-tree hello-time CLI command to configure the STP bridge hello time from 1 to 10 seconds.
• Upgraded OpenSSL to version 3.5.2 LTS.

Bug Fixes:

• Fixes the issue where generating HTTPS certificates and SSH host keys on a stacked switch could cause stack instability and a traffic storm that made the switch unreachable. [CE-7606]
• Fixes the issue where the buffered log was flooded with repeated Event(0x5c000001) messages. [CE-7871]
• Fixes the issue where the output of the show ip pim statistics command was misaligned. [CE-7569]
• Fixes the issue where the output of the show ipv6 pim statistics command was misaligned. [MS-6067]
• Fixes the issue where the switch could stop responding while it was managed through the AV UI. [MS-6007]
• Fixes the issue where the crypto dhparam size 1024 command was accepted but caused HTTPS to stop working. The switch now rejects 1024 and uses 2048. [MS-6227]
• Fixes the issue where the switch accepted an HTTPS certificate that did not match its private key, which caused HTTPS to stop working. [MS-6231]
• Fixes the issue where the switch accepted an HTTPS certificate with an RSA 1024-bit key or a SHA-1 signature, which caused HTTPS to stop working. [MS-6230]

Known Issues:

• After a configuration clear, the original VLAN 1 profile remains for up to 1 minute the first time you log in. All configurations are cleared and there is no functional impact.
• If a PoE schedule is applied to the same port multiple times, only the most recent schedule takes effect. The device UI might display a conflicting schedule as active, but this status is not valid.
• Kramer AV Single-VLAN Profile Cannot Be Modified When Using VLAN 1:
  If a Kramer AV profile is created with a single VLAN and that VLAN is VLAN 1, the profile cannot be modified to another single-VLAN profile.
  Workaround: Use a VLAN ID other than VLAN 1 when creating a single-VLAN Kramer AV profile.
• After you upgrade the firmware from 12.0.9.x to 12.0.11.x or a newer release, when you use the device UI, and you select Routing > Multicast > Mroute Static-Multicast Configuration, the page does not display automatically.
  Workaround: After the firmware upgrade, clear your browser cache.
• When you manually enable Auto Negotiation through the CLI, it does not display as Enabled in the AV UI.
  Workaround: Configure and verify Auto Negotiation through the CLI.
• G&D Control Center IP devices fail to link up with the switch.
  Workaround: Manually set the switch port speed to 1G to establish the link.
• In a stacking configuration, intermittent stack instability might occur.
  Workaround: Disable AppMgr by entering the no application install appmgr command in global configuration mode.

Warnings:

Read and follow these warnings before updating your firmware:

• For user passwords, line passwords, and enable passwords that are encrypted with AES in firmware release 12.0.15.7 or earlier releases, automatic migration is supported to the more secure SHA512 in release 12.0.17.6 or later releases.
• User passwords, line passwords, and enable passwords that are encrypted with MD5 (salted) in firmware release 12.0.15.7 or earlier releases are not migrated to release 12.0.17.6 or later releases, so they must be set manually.
• SNMPv3 MD5 and SHA-based passwords from firmware release 12.0.15.7 or earlier releases are not migrated to release 12.0.17.6 or later releases, so they must be set manually.

General Information:

• The boot code remains at the existing version 1.0.0.18 in this switch firmware.
• The process of upgrading the firmware and boot code takes about three minutes. Apply the update bootcode command from the command line interface. Do not switch off or restart the device during the upgrade process.
• AppMgr remains with existing version 1.0.7.19 in this switch firmware.

Download Link: https://www.downloads.netgear.com/files/GDC/M4300/M4300_V12.0.19.24.zip
 

Firmware Update Instructions:

To update your product’s firmware, follow the instructions in your product’s user manual. To find your user manual, visit https://www.netgear.com/support/enterprise/, enter your model number in the search box, and click the Documentation button on the product page.