CVE-2021-40546

MEDIUMNVD 4.94.9—Elevated

4.9

Tenda AC6 US_AC6V4.0RTL_V02.03.01.26_cn.bin allows attackers (who have the administrator password) to cause a denial of service (device crash) via a long string in the wifiPwd_5G parameter to /goform/setWifi.

CVSS v3: 4.9
EG Score: 4.9(medium)
EPSS: 20.5%
KEV: Not listed

Published

September 5, 2023

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://github.com/doudoudedi/buffer_overflow/blob/main/Tenda%20AC6%20V4.0-Denial%20of%20Service%20Vulnerability.md
af854a3a-2127-422b-91ae-364da2661108https://github.com/doudoudedi/buffer_overflow/blob/main/Tenda%20AC6%20V4.0-Denial%20of%20Service%20Vulnerability.md

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-404Improper Resource Shutdown or Release

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 18:09 UTCEG score recompute
2026-05-24 18:09 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-40546?

CVE-2021-40546 is a medium vulnerability published on September 5, 2023. Tenda AC6 USAC6V4.0RTLV02.03.01.26cn.bin allows attackers (who have the administrator password) to cause a denial of service (device crash) via a long string in the wifiPwd5G parameter to /goform/setWifi.

When was CVE-2021-40546 disclosed?

CVE-2021-40546 was first published in the National Vulnerability Database on September 5, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-40546 actively exploited?

CVE-2021-40546 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-40546?

CVE-2021-40546 has a CVSS v3 base score of 4.9 (NVD).

How do I remediate CVE-2021-40546?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40546, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2021-40546

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-40546?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (2)

Frequently asked(5)

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