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CVE-2021-20090 is a path traversal vulnerability in the web management interfaces of Arcadyan-based router firmware, including Buffalo WSR-2533DHPL2 firmware version 1.02 and earlier and WSR-2533DHP3 firmware version 1.24 and earlier. The flaw allows an unauthenticated remote attacker to send crafted requests containing relative path traversal sequences to reach protected resources without completing normal authentication checks. On affected devices, exploitation can expose sensitive information from the management interface and permit access to functionality that should be restricted to authenticated administrators. The vulnerability is notable because it affects internet-facing router administration surfaces and can be used as a stepping stone to further compromise of the device configuration and the network it protects.
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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.
3 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.
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.