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CVE-2021-20090 is a path traversal vulnerability in the web interfaces of Arcadyan-based routers that allows unauthenticated remote attackers to bypass authentication. Affected devices include Buffalo WSR-2533DHPL2 routers running firmware version 1.02 or earlier and WSR-2533DHP3 routers running firmware version 1.24 or earlier, as well as devices from multiple other vendors using affected Arcadyan-based firmware. Exploitation permits access to protected resources, disclosure of sensitive information, and modification of router configuration. Dark IoT botnet samples and the Matrix campaign have targeted this vulnerability.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in Arcadyan-based router firmware, exploited for unauthorized access and botnet recruitment.
A directory traversal vulnerability in certain router models that allows unauthenticated remote attackers to access sensitive information or execute commands.
A path traversal vulnerability affecting Buffalo routers and models from multiple other vendors. Dark IoT, a Mirai variant, used it in conjunction with CVE-2021-20091 in the illustrated exploit.
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.