CVE-2021-28150

MEDIUMNVD 5.55.5—Elevated

5.5

Hongdian H8922 3.0.5 devices allow the unprivileged guest user to read cli.conf (with the administrator password and other sensitive data) via /backup2.cgi.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 99.1%
KEV: Not listed

Published

May 6, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttp://en.hongdian.com/Products/Details/H8922
cve@mitrehttps://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/
af854a3a-2127-422b-91ae-364da2661108http://en.hongdian.com/Products/Details/H8922
af854a3a-2127-422b-91ae-364da2661108https://ssd-disclosure.com/ssd-advisory-hongdian-h8922-multiple-vulnerabilities/

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 13× 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
2026-06-02 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
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-26 16:59 UTCEG score recompute
2026-05-26 16:59 UTCGHSA enrichment

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-2021-28150.yaml
First seen Jan 1, 2021
Hongdian H8922 3.0.5 - Information Disclosure
Open source ↗

Frequently asked(5)

What is CVE-2021-28150?

CVE-2021-28150 is a medium vulnerability published on May 6, 2021. Hongdian H8922 3.0.5 devices allow the unprivileged guest user to read cli.conf (with the administrator password and other sensitive data) via /backup2.cgi.

When was CVE-2021-28150 disclosed?

CVE-2021-28150 was first published in the National Vulnerability Database on May 6, 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-2021-28150 actively exploited?

CVE-2021-28150 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-28150?

CVE-2021-28150 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-28150?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-28150, 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-2021-28150

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(2)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-28150?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

Related CVEs(same CWE)