How severe is CVE-2022-21173?

CVE-2022-21173 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-21173 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-21173?

CVE-2022-21173 primarily affects Elecom Wrh-300bk3 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-21173?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2022-21173 published?

CVE-2022-21173 was published on 2022-02-08 and last updated on 2026-06-17.

CVE-2022-21173

CVE-2022-21173 is a high-severity vulnerability in Elecom Wrh-300bk3 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 8.3
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Elecom Wrh-300bk3 Firmware
Published: 2022-02-08
Last modified: 2026-06-17

Description

Hidden functionality vulnerability in ELECOM LAN routers (WRH-300BK3 firmware v1.05 and earlier, WRH-300WH3 firmware v1.05 and earlier, WRH-300BK3-S firmware v1.05 and earlier, WRH-300DR3-S firmware v1.05 and earlier, WRH-300LB3-S firmware v1.05 and earlier, WRH-300PN3-S firmware v1.05 and earlier, WRH-300WH3-S firmware v1.05 and earlier, and WRH-300YG3-S firmware v1.05 and earlier) allows an attacker on the adjacent network to execute an arbitrary OS command via unspecified vectors.

Frequently asked questions

What is CVE-2022-21173?: Hidden functionality vulnerability in ELECOM LAN routers (WRH-300BK3 firmware v1.05 and earlier, WRH-300WH3 firmware v1.05 and earlier, WRH-300BK3-S firmware v1.05 and earlier, WRH-300DR3-S firmware v1.05 and earlier, WRH-300LB3-S firmware v1.05 and earlier, WRH-300PN3-S firmware v1.05 and earlier, WRH-300WH3-S firmware v1.05 and earlier, and WRH-300YG3-S firmware v1.05 and earlier) allows an attacker on the adjacent network to execute an arbitrary OS command via unspecified vectors.
How severe is CVE-2022-21173?: CVE-2022-21173 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-21173 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-21173?: CVE-2022-21173 primarily affects Elecom Wrh-300bk3 Firmware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-21173?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2022-21173 published?: CVE-2022-21173 was published on 2022-02-08 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:elecom:wrh-300bk3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300wh3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300bk3-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300wh3-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300lb3-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300pn3-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300yg3-s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:elecom:wrh-300dr3-s_firmware:*:*:*:*:*:*:*:*