CVE-2021-31627

HIGHNVD 8.88.8—Trending — 3 sources updated this week

8.8

Buffer Overflow vulnerability in Tenda AC9 V1.0 through V15.03.05.19(6318), and AC9 V3.0 V15.03.06.42_multi, allows attackers to execute arbitrary code via the index parameter.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 30.0%
KEV: Not listed

Published

October 29, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://tenda.com
cve@mitrehttps://github.com/Lyc-heng/routers/blob/main/routers/stack3.md
af854a3a-2127-422b-91ae-364da2661108http://tenda.com
af854a3a-2127-422b-91ae-364da2661108https://github.com/Lyc-heng/routers/blob/main/routers/stack3.md

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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.

2026-05-28 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 08:18 UTCEG score recompute
2026-05-26 08:18 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-31627?

CVE-2021-31627 is a high vulnerability published on October 29, 2021. Buffer Overflow vulnerability in Tenda AC9 V1.0 through V15.03.05.19(6318), and AC9 V3.0 V15.03.06.42_multi, allows attackers to execute arbitrary code via the index parameter.

When was CVE-2021-31627 disclosed?

CVE-2021-31627 was first published in the National Vulnerability Database on October 29, 2021, 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-2021-31627 actively exploited?

CVE-2021-31627 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-31627?

CVE-2021-31627 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2021-31627?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31627, 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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-31627

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Is Your Infrastructure Affected by CVE-2021-31627?

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CVE-2021-31627

📅 Published

🔄 Last Modified

🔗 References (4)