CVE-2021-42887

CRITICALNVD 9.89.8—Elevated

9.8

In TOTOLINK EX1200T V4.1.2cu.5215, an attacker can bypass login by sending a specific request through formLoginAuth.htm.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 98.1%
KEV: Not listed

Published

June 3, 2022

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_login_bypass.md
af854a3a-2127-422b-91ae-364da2661108https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_login_bypass.md

Data Freshness Timeline

(refreshed 9× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore
2026-05-28 13:43 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Nucleihttp/cves/2021/CVE-2021-42887.yaml
First seen Jan 1, 2021
TOTOLINK EX1200T 4.1.2cu.5215 - Authentication Bypass
Open source ↗

Frequently asked(5)

What is CVE-2021-42887?

CVE-2021-42887 is a critical vulnerability published on June 3, 2022. In TOTOLINK EX1200T V4.1.2cu.5215, an attacker can bypass login by sending a specific request through formLoginAuth.htm.

When was CVE-2021-42887 disclosed?

CVE-2021-42887 was first published in the National Vulnerability Database on June 3, 2022, 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-2021-42887 actively exploited?

CVE-2021-42887 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42887?

CVE-2021-42887 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-42887?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42887, 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-2021-42887

📅 Published

🔄 Last Modified

🔗 References (2)