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CVE-2021-28149 is a directory traversal vulnerability in the log export handler of Hongdian H8922 3.0.5 devices. The /log_download.cgi endpoint does not validate user-controlled input in the type parameter. An authenticated remote attacker with minimal privileges can supply directory-traversal sequences to request files outside the intended log-export location, including system files such as /etc/passwd.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability mentioned only in a listed exploit possibly used by BlackTech; no further details are provided.
A Hongdian H8922 router vulnerability used with CVE-2021-28152 in an exploit enabling directory traversal and remote command execution as root.
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.