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CVE-2026-77556 is an out-of-bounds read vulnerability affecting certain Ubiquiti UniFi gateway devices. A malicious actor with network-path access can trigger the out-of-bounds read condition, resulting in a denial-of-service condition on the targeted device. Technical details identifying the vulnerable component and precise triggering input are not available.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Eine hoch bewertete Out-of-bounds-Read-Schwachstelle in Ubiquiti-UniFi-Firewalls und -Gateways, die bei Netzwerkzugriff einen Denial of Service verursachen kann.
An out-of-bounds read vulnerability in certain UniFi gateway devices that a network-accessible attacker could exploit to cause denial of service.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.