CVE-2021-20854
CVE-2021-20854 is a medium-severity vulnerability in Elecom Wrh-733gbk Firmware with a CVSS 3.x base score of 6.8. 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-78.
Key facts
- Severity: Medium (CVSS 3.x base score 6.8)
- CVSS v2: 5.2
- EPSS exploit prediction: 0% (36th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-78
- Affected product: Elecom Wrh-733gbk Firmware
- Published:
- Last modified:
Description
ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.
Frequently asked questions
- What is CVE-2021-20854?
- ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a network-adjacent attacker with an administrator privilege to execute arbitrary OS commands via unspecified vectors.
- How severe is CVE-2021-20854?
- CVE-2021-20854 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-20854 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-2021-20854?
- CVE-2021-20854 primarily affects Elecom Wrh-733gbk Firmware. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-20854?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-20854 published?
- CVE-2021-20854 was published on 2021-12-01 and last updated on 2026-06-17.
References
Affected products (2)
- cpe:2.3:o:elecom:wrh-733gbk_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:elecom:wrh-733gwh_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Elecom Wrh-733gbk Firmware
- CVE-2021-20853 — Medium (CVSS 6.8): ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a…
- CVE-2021-20852 — Medium (CVSS 6.8): Buffer overflow vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware…
- CVE-2021-20856 — Medium (CVSS 5.4): Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware…
- CVE-2021-20855 — Medium (CVSS 5.4): Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware…
All CVEs affecting Elecom Wrh-733gbk Firmware →
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