Quick answers
- Is CVE-2026-77544 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77544 being exploited in the wild.
- How severe is CVE-2026-77544?
- High severity, with a CVSS score of 7.5, published 22 September 2026.
- Which products and versions are affected?
- Ubiquiti UniFi Gateway.
- Is there a fix for CVE-2026-77544?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-77544 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-77544?
- Check whether you run Ubiquiti UniFi Gateway. 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
An out-of-bounds write vulnerability exists in UniFi Gateway firmware, exploitable via network access without authentication. Successful exploitation causes a denial of service by crashing or hanging the gateway process. The vulnerability requires the attacker to be on the same network or have adjacent network access to the device.
Affected products
- Ubiquiti UniFi Gateway
Timeline
- 2026-09-22: disclosed