How severe is CVE-2021-27404?

CVE-2021-27404 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-27404 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27404?

CVE-2021-27404 affects Asus Askey Rtf8115vw Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-27404?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-27404 published?

CVE-2021-27404 was published on 2021-02-19 and last updated on 2026-06-17.

CVE-2021-27404

CVE-2021-27404 is a medium-severity vulnerability in Asus Askey Rtf8115vw Firmware with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Asus Askey Rtf8115vw Firmware
Published: 2021-02-19
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-27404?: Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices allow injection of a Host HTTP header.
How severe is CVE-2021-27404?: CVE-2021-27404 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-27404 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27404?: CVE-2021-27404 affects Asus Askey Rtf8115vw Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-27404?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-27404 published?: CVE-2021-27404 was published on 2021-02-19 and last updated on 2026-06-17.

References

https://github.com/bokanrb/HostHeaderInjection-Askey

Affected products (1)

cpe:2.3:o:asus:askey_rtf8115vw_firmware:br_sv_g11.11_rtf_tef001_v6.54_v014:*:*:*:*:*:*:*

More vulnerabilities in Asus Askey Rtf8115vw Firmware

CVE-2021-27403 — Medium (CVSS 6.1): Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices allow cgi-bin/te_acceso_router.cgi curWebPage XSS.

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