What is CVE-2021-27404?

CVE-2021-27404 is a medium-severity vulnerability in ASUS Askey Rtf8115vw, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-19.

How severe is CVE-2021-27404?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2021-27404 known to be exploited?

15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in ASUS Askey Rtf8115vw

CVE-2021-27404

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

Vulnerability class: Open Redirect

Published 2021-02-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (57.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

ASUS Askey Rtf8115vw
ASUS Askey Rtf8115vw Firmware — versions br_sv_g11.11_rtf_tef001_v6.54_v014

Weakness classification (CWE)

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

Public proof-of-concept exploits

References

github.com/bokanrb/HostHeaderInjection-Askey (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27404?: CVE-2021-27404 is a medium-severity vulnerability in ASUS Askey Rtf8115vw, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.1/10. Published 2021-02-19.
How severe is CVE-2021-27404?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-27404 known to be exploited?: 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.