Home › UniFi OS (Dream Machines) › 5.1.12
UniFi OS (Dream Machines) 5.1.12 – safe to update?
2 problem reports and 0 positive reports found on Reddit (plus 8 other mentions). Out for 149 days; a few isolated problem posts is normal background for a product this widely used. Skim them if your setup is similar.
Newer release in this line: UniFi OS (Dream Machines) 5.1.33 (2026-09-09). If you're updating now, check that one instead — it may already fix the issues reported here.
Security update: this release fixes security issues. Waiting carries its own risk — if your device is exposed, weigh that against the reports below.
Did you install 5.1.12?
Thanks — your vote is counted.
What's in this release
Overview UniFi OS 5.1.12 includes the improvements and bugfixes below. Bundled application • UniFi Network 10.3.58 Improvements • Added support for Ad Blocking and Content Filtering with Policy-Based Routing. • Added support for IPv6 WireGuard VPN clients. • Added support for automatic Let’s Encrypt certificates. • Ad…
Source: community.ui.com RSS
CVEs fixed
No CVEs mapped to this release, though the vendor flags it as a security update.
Community reports
- Problem
UniFi OS 5.1.12 regression: ALLOW firewall rules missing from Flows and PBR events missing from Logs for nearly 2 months · Reddit · 2026-07-24
I've had an open support case with Ubiquiti for nearly two months regarding what appears to be a regression introduced in UniFi OS 5.1.12 , and I'm wondering if anyone else is seeing the same behavior. Since upgrading to UniFi OS 5.1.12 , I've noticed two issues: Custom ALLOW fi…
- Problem
Specific Models of AP looping at specific location · Reddit · 2026-06-09
Having a very strange issue I can't quite pinpoint the cause of. We have a site that runs a CK+ to manage about 20 switches and 14 APs. All was functioning fine for years up until the CK+ updated to 5.1.12. Since that day all of our U6 Ent, U6 Ent IW, and U6 IW specifically, won…
- Mention
AI Port struggling with 2 ONVIF & delayed detections · Reddit · 2026-08-24
Disappointed w/ the AI Port so far. I have two ONVIF cameras running at 15 FPS and 2 Mbps, well within the advertised limits. With both paired, detections are delayed from the actual video. Protect shows the blue tracking box, but the person or vehicle is already gone. If I scru…
- Mention
Built an MCP server for UniFi around the assumption the LLM will misbehave: dry-run, audit log, composite rollback · Reddit · 2026-08-03
Saw the "gave Claude the keys" thread a couple of weeks ago and figured this was worth sharing because there's a lot of fear and misinformation about how to build and use these tools... I've been building an MCP server for UniFi for months from the same premise the skeptics rais…
- Mention
Performance issue with SD-Wan running three sites 2xUDM / 1xUDR7 · Reddit · 2026-06-15
Well titles says all... I have three sites, each connected through 1Gbs fiber (and even 10Gbps fiber in one case). All are direct IP access (no DMZ, no double NAT). I created a Fabric and enabled SD-Wan Mesh across all three sites. Each site has two subnets (main, IoT). My probl…
- Mention
Site-to-site IPsec tunnel stays "established" but stops passing traffic — XFRM mark policies missing after CHILD_SA rekey (UDM Pro, OS 5.1.12, Network 10.3.58) · Reddit · 2026-06-08
Environment UDM Pro on UniFi OS 5.1.12, Network 10.3.58 WAN is PPPoE One site-to-site IPsec tunnel to a third-party Cisco peer IKEv2, AES-256/SHA-256/DH14 IKE SA lifetime 86400s, CHILD_SA lifetime 28800s, both ends matched Route-based via vti64, traffic selectors 0.0.0.0/0 === 0…
- Mention
UDMP reports APs are offline and UI very slow until restart · Reddit · 2026-06-04
UniFi OS 5.1.12, Network 10.4.57, U6+ 6.7.41 In the past week or so (seemingly after the last UnifiOS and Network upgrade), my UDMP starts reporting my U6+ APs are offline and access the web UI is slow/nearly impossible both through unifi.ui.com and locally. If I can finally get…
- Mention
WAN3 (U5G Max) identifies as wrong ISP · Reddit · 2026-06-03
I just noticed that WAN3 from my U5G Max is showing the wrong ISP name. If I look at the U5G, it correctly shows that I have a T-Mobile SIM installed and am connected. If I look at the dashboard though, or check the Internet tab, it shows as "AT&T Wireless". I did, briefly, have…
- Mention
Need Help - UCG Fiber - port forwarding - ZBF issues · Reddit · 2026-06-02
okay I know there are a number of posts on this but none seem to address my issue or at least I can’t figure it out from what is there lol. I just got in to Unifi and am trying to set everything up to be security conscience, but I am having a hell of a time lol. First my setup.…
- Mention
Massive issues with UniFi WIFi since 2-3 weeks on 2.4Ghz and 5Ghz · Reddit · 2026-05-31
Hi guys, I am using UniFi since years without any issues but since 2-3 weeks I have unbearable issues with WiFi on both 2.4Ghz and 5Ghz. LAN works without any issues! I cannot find a reason and hopefully someone can point me in a direction. I think I remember I did firmware upgr…
Reports are found automatically and labelled by an AI model plus keyword rules — they can be wrong. Open the post to judge for yourself.
UniFi OS (Dream Machines) 5.1.15 →
Other UniFi OS (Dream Machines) versions
- 5.1.33 2026-09-09
- 5.1.31 2026-08-20
- 5.1.30 Release candidate / early access 2026-08-17
- 5.1.27 Release candidate / early access 2026-08-04
- 5.1.26 2026-07-22
- 5.1.19 2026-06-17
- 5.1.15 2026-06-01
- 5.1.12 2026-05-21
The weekly "safe to update?" email
One short email a week: what shipped, what broke, and what's safe to install. No spam.
Thanks — you're on the list.
We store only your email address and the date you signed up, to send this newsletter. We never sell or share it. Every email will have a one-click unsubscribe; you can also ask us to delete your address at any time. Privacy details.