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CVE-2024-40891 is a post-authentication OS command injection vulnerability affecting the legacy DSL CPE Zyxel VMG4325-B10A running firmware version 1.00(AAFR.4)C0_20170615. According to the provided description, the flaw exists in management commands exposed via Telnet. An authenticated attacker can abuse insufficient sanitization in those management command handlers to inject and execute arbitrary operating system commands on the device. Reporting in the supporting content further characterizes the issue as a telnet-based command-injection flaw in Zyxel CPE devices and notes active exploitation in the wild. The assignment text also states the product is unsupported when assigned, indicating the affected firmware/device line is legacy and not receiving normal security maintenance.
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What an attacker gets, and what they’ve been doing with it.
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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.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical vulnerability in Zyxel CPE Series devices enabling arbitrary command execution; reported as under active exploitation attempts.
Unknown (the content only notes that Zyxel CPE devices are impacted, without describing the vulnerability type or impact).
A vulnerability affecting Zyxel CPE devices referenced as flagged by Shadowserver.
A previously disclosed unpatched telnet command injection vulnerability in Zyxel CPE devices, mentioned as part of Zyxel's security history.
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.