CVE-2021-27404

MEDIUMNVD 6.16.1—Elevated

6.1

Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices allow injection of a Host HTTP header.

CVSS v3: 6.1
EG Score: 6.1(medium)
EPSS: 37.0%
KEV: Not listed

Published

February 19, 2021

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://github.com/bokanrb/HostHeaderInjection-Askey
af854a3a-2127-422b-91ae-364da2661108https://github.com/bokanrb/HostHeaderInjection-Askey

Weakness Classification(1)

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

CWE-601URL Redirection to Untrusted Site (Open Redirect)

Data Freshness Timeline

(refreshed 11× in last 7d / 19× 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
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 20:38 UTCEG score recompute
2026-05-26 20:38 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 16:16 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCbokanrb/CVE-2021-27404
First seen Feb 18, 2021
HostHeaderInjection-Askey
Open source ↗

Frequently asked(5)

What is CVE-2021-27404?

CVE-2021-27404 is a medium vulnerability published on February 19, 2021. Askey RTF8115VW BRSVg11.11RTFTEF001V6.54V014 devices allow injection of a Host HTTP header.

When was CVE-2021-27404 disclosed?

CVE-2021-27404 was first published in the National Vulnerability Database on February 19, 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-2021-27404 actively exploited?

CVE-2021-27404 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-27404?

CVE-2021-27404 has a CVSS v3 base score of 6.1 (NVD).

How do I remediate CVE-2021-27404?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-27404, 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-2021-27404

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-27404?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

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