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CVE-2026-74233, known as DARKLANTERN, is an unauthenticated OS command-injection vulnerability in the infosrvd service included in multiple Zbtlink and white-labeled router firmware builds. The UDP service accepts a supplied shell command that is passed to the operating system for execution. Its nominal authentication is ineffective: token generation relies on a hardcoded salt, and MAC-address validation accepts an all-zero six-byte value as a wildcard. This permits a remote unauthenticated attacker to submit a crafted UDP command packet and execute arbitrary commands with root privileges. Affected products include specified firmware builds for Zbtlink WE1326, WE357, WE5926 variants, WE826 variants, WG108, WG3526, WE2426-C, WE5926-EC_QP, and WF3526-P, as well as CTN720-W1, LF-1541, MT7620N, and WRC1 devices.
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What an attacker gets, and what they’ve been doing with it.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated remote root command-execution backdoor in ZBT router firmware. The firmware firewall permits Internet-facing UDP/9992 connections, while the implant's token and MAC checks are readily bypassed.
A critical unauthenticated remote root command-execution flaw in the DARKLANTERN factory implant/service in ZBT-derived router firmware. The exposed UDP listener uses bypassable authentication.
A critical unauthenticated command-injection backdoor in the infosrvd WAN listener of affected ZBT router firmware. Internet-reachable UDP port 9992 accepts crafted packets that result in root shell command execution; its token and MAC-address checks can be bypassed by design.
An unauthenticated remote command-injection vulnerability in the infosrvd UDP service on port 9992 in affected Zbtlink and related router firmware. Attackers can execute arbitrary commands as root because the service authentication can be bypassed through an all-zero wildcard MAC and uses a hardcoded salt.
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.