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CVE-2026-16347 is an authentication weakness in MikroTik RouterOS and Cloud Hosted Router affecting API access. The flaw arises from improper restriction of excessive authentication attempts: the API does not implement effective rate limiting, account lockout, or source-based restrictions for repeated login failures. Some affected versions introduce a fixed per-connection delay, but that control can be bypassed by using concurrent sessions, allowing sustained high-volume password guessing. This weakness materially increases the likelihood that an attacker can brute-force, spray, or stuff credentials until valid administrative credentials are found, leading to unauthorized access to management services.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.