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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 handler exposed at the /goform/setmac endpoint, where insufficient bounds checking on attacker-controlled POST data allows a crafted request to overflow a stack buffer. Successful exploitation can corrupt control data on the stack and achieve arbitrary code execution on the device. The issue is remotely reachable through the router’s management interface and has been reported as exploited in the wild, particularly when remote administration is enabled.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Tenda AC11 firmware vulnerability listed among vulnerabilities actively exploited or operationally weaponized in July 2026.
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 stack buffer overflow vulnerability affecting Tenda AC11 devices, mentioned as one of the other CVEs utilized in the campaign's scanning and exploitation activity.
A historical Tenda router buffer overflow vulnerability referenced as part of the vendor'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.