What is CVE-2021-27403?

CVE-2021-27403 is a medium-severity vulnerability in ASUS Askey Rtf8115vw, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-02-19.

How severe is CVE-2021-27403?

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

Is CVE-2021-27403 known to be exploited?

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

XSS in ASUS Askey Rtf8115vw

CVE-2021-27403

Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices allow cgi-bin/te_acceso_router.cgi curWebPage XSS.

Vulnerability class: XSS (Cross-Site Scripting)

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: 0.012 (67.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · 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-79 — Cross-site Scripting

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2021-27403?: CVE-2021-27403 is a medium-severity vulnerability in ASUS Askey Rtf8115vw, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-02-19.
How severe is CVE-2021-27403?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-27403 known to be exploited?: 14 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.