CVE-2021-35327

CRITICALNVD 9.89.8—

9.8

A vulnerability in TOTOLINK A720R A720R_Firmware v4.1.5cu.470_B20200911 allows attackers to start the Telnet service, then login with the default credentials via a crafted POST request.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 63.6%
KEV: Not listed

Published

August 5, 2021

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated May 26, 2026

No patch confirmed yet.

generic

my_cves/router/totolink/A720R_default_telnet_info.md at master · hurricane618/my_cves · GitHub

https://github.com/hurricane618/my_cves/blob/master/router/totolink/A720R_default_telnet_info.md

Weakness Classification(1)

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

CWE-862Missing Authorization

Data Freshness Timeline

(refreshed 12× 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.

2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
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
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2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 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
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 12:32 UTCEG score recompute
2026-05-26 12:32 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-35327?

CVE-2021-35327 is a critical vulnerability published on August 5, 2021. A vulnerability in TOTOLINK A720R A720RFirmware v4.1.5cu.470B20200911 allows attackers to start the Telnet service, then login with the default credentials via a crafted POST request.

When was CVE-2021-35327 disclosed?

CVE-2021-35327 was first published in the National Vulnerability Database on August 5, 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-2021-35327 actively exploited?

CVE-2021-35327 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-35327?

CVE-2021-35327 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-35327?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35327, 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

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CVE-2021-35327

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

my_cves/router/totolink/A720R_default_telnet_info.md at master · hurricane618/my_cves · GitHub

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-35327?

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Advisory Details (1)

Frequently asked(5)

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