CVE-2021-31755Vulnerability
Tenda AC11 Router Stack Buffer Overflow Vulnerability
Exploited in the wildCISA added it to its Known Exploited Vulnerabilities list on .
Reported by 2 independent sources · first reported by Group-IB · last reported
Last reported 2 months ago
CISA KEVAdded 3 Nov 2021
Fix due 17 Nov 2021
Used by ransomware: not knownCISA KEV catalogue
Fix due 17 Nov 2021
Used by ransomware: not knownCISA KEV catalogue
EPSS86.5%
higher than 99% of CVEsFIRST EPSS, as of 21 Oct 2026
higher than 99% of CVEsFIRST EPSS, as of 21 Oct 2026
What the reports say
2 reports, newest first · the exact sentence from each-
July 2026 CVE Landscape“CVE-2021-31755”
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JadeProx: Tracing a China-nexus Operation Through an OPSEC Mistake“CVE-2021-31755 – A stack buffer overflow vulnerability on Tenda AC11 devices – [CVSS 9.8].”
Indicators reported together
named in the same reportsAlso named with it: CVE-2018-11511, CVE-2021-32305, CVE-2021-24139, CVE-2025-49113, CVE-2026-33824, CVE-2024-42009, CVE-2026-15409, CVE-2026-15410, CVE-2026-25089, CVE-2026-39808, CVE-2026-42897, CVE-2025-55182, CVE-2018-0802, CVE-2026-50522, CVE-2026-58644, CVE-2025-3248, CVE-2008-4128, CVE-2017-17215, CVE-2021-4034, CVE-2021-27137
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