CVE-2021-20847

Name: CVE-2021-20847
Creator: NVD / NIST
Published: 2021-12-01T03:15:06.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.81%

Last modified Jun 17, 2026

CVE-2021-20847 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross-site scripting vulnerability in Wi-Fi STATION SH-52A (38JP_1_11G, 38JP_1_11J, 38JP_1_11K, 38JP_1_11L, 38JP_1_26F, 38JP_1_26G, 38JP_1_26J, 38JP_2_03B, and 38JP_2_03C) allows a remote unauthenticated attacker to inject an arbitrary script via WebUI of the device.. EPSS estimates a 0.81% chance of exploitation in the next 30 days.

Description

Cross-site scripting vulnerability in Wi-Fi STATION SH-52A (38JP_1_11G, 38JP_1_11J, 38JP_1_11K, 38JP_1_11L, 38JP_1_26F, 38JP_1_26G, 38JP_1_26J, 38JP_2_03B, and 38JP_2_03C) allows a remote unauthenticated attacker to inject an arbitrary script via WebUI of the device.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.81%

52.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_11g
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_11j
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_11k
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_11l
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_26f
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_26g
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_1_26j
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_2_03b
Nttdocomo	Wi-Fi Station Sh-52a Firmware	38jp_2_03c

References

https://jvn.jp/en/jp/JVN19482703/index.htmlThird Party Advisory
https://www.nttdocomo.co.jp/support/product_update/sh52a/index.htmlThird Party Advisory
https://jvn.jp/en/jp/JVN19482703/index.htmlThird Party Advisory
https://www.nttdocomo.co.jp/support/product_update/sh52a/index.htmlThird Party Advisory

Timeline

Published: Dec 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20847?

How severe is CVE-2021-20847?

CVE-2021-20847 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20847?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20847?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST