How severe is CVE-2021-20847?

CVE-2021-20847 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-2021-20847 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20847?

CVE-2021-20847 primarily affects Nttdocomo Wi-fi Station Sh-52a Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20847?

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

When was CVE-2021-20847 published?

CVE-2021-20847 was published on 2021-12-01 and last updated on 2026-06-17.

CVE-2021-20847

CVE-2021-20847 is a medium-severity vulnerability in Nttdocomo Wi-fi Station Sh-52a 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Nttdocomo Wi-fi Station Sh-52a Firmware
Published: 2021-12-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-20847?: 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.
How severe is CVE-2021-20847?: CVE-2021-20847 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-2021-20847 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20847?: CVE-2021-20847 primarily affects Nttdocomo Wi-fi Station Sh-52a Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20847?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20847 published?: CVE-2021-20847 was published on 2021-12-01 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_11g:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_11j:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_11k:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_11l:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_26f:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_26g:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_1_26j:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_2_03b:*:*:*:*:*:*:*
cpe:2.3:o:nttdocomo:wi-fi_station_sh-52a_firmware:38jp_2_03c:*:*:*:*:*:*:*

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