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CVE-2021-31755 is a stack-based buffer overflow vulnerability affecting Tenda AC11 routers running firmware through 02.03.01.104_CN. The flaw is present in the web management functionality exposed via the /goform/setmac endpoint. A crafted POST request to this endpoint can trigger a stack overflow, allowing an attacker to overwrite stack memory and potentially redirect execution flow. Successful exploitation can result in arbitrary code execution on the device.
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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 critical vulnerability in Tenda AC11 routers that the JadeProx operators attempted to exploit; the article also notes it is listed in CISA's Known Exploited Vulnerabilities catalog.
A historical Tenda router buffer overflow vulnerability referenced as part of the vendor's security history.
Referenced only as part of a repository name in attacker infrastructure/IoCs; no vulnerability details are provided in the content.
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.