CVE-2021-21745

MEDIUMNVD 4.34.3—Elevated

4.3

ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.

CVSS v3: 4.3
EG Score: 4.3(medium)
EPSS: 97.2%
KEV: Not listed

Published

October 20, 2021

Last Modified

November 21, 2024

References (2)

psirt@ztehttps://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1019764
af854a3a-2127-422b-91ae-364da2661108https://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1019764

Weakness Classification(2)

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

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.

2026-06-05 22:45 UTCepss_batch
2026-06-05 22:45 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 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
2026-05-26 08:41 UTCEG score recompute
2026-05-26 08:41 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 07:07 UTCOSV refresh

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-2021-21745.yaml
First seen Jan 1, 2021
ZTE MF971R - Referer authentication bypass
Open source ↗

Frequently asked(5)

What is CVE-2021-21745?

CVE-2021-21745 is a medium vulnerability published on October 20, 2021. ZTE MF971R product has a Referer authentication bypass vulnerability. Without CSRF verification, an attackercould use this vulnerability to perform illegal authorization operations by sending a request to the user to click.

When was CVE-2021-21745 disclosed?

CVE-2021-21745 was first published in the National Vulnerability Database on October 20, 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-2021-21745 actively exploited?

CVE-2021-21745 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-21745?

CVE-2021-21745 has a CVSS v3 base score of 4.3 (NVD).

How do I remediate CVE-2021-21745?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21745, 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-2021-21745

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(2)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-21745?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)