How severe is CVE-2016-4821?

CVE-2016-4821 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2016-4821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4821?

CVE-2016-4821 affects Iodata Etx-r Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-4821?

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

When was CVE-2016-4821 published?

CVE-2016-4821 was published on 2016-06-19 and last updated on 2026-06-17.

CVE-2016-4821

CVE-2016-4821 is a medium-severity vulnerability in Iodata Etx-r Firmware with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Iodata Etx-r Firmware
Published: 2016-06-19
Last modified: 2026-06-17

Description

I-O DATA DEVICE ETX-R devices allow remote attackers to cause a denial of service (web-server crash) via unspecified vectors.

Frequently asked questions

What is CVE-2016-4821?: I-O DATA DEVICE ETX-R devices allow remote attackers to cause a denial of service (web-server crash) via unspecified vectors.
How severe is CVE-2016-4821?: CVE-2016-4821 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2016-4821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4821?: CVE-2016-4821 affects Iodata Etx-r Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-4821?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-4821 published?: CVE-2016-4821 was published on 2016-06-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:iodata:etx-r_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Iodata Etx-r Firmware

CVE-2016-4820 — High (CVSS 8.8): Cross-site request forgery (CSRF) vulnerability on I-O DATA DEVICE ETX-R devices allows remote attackers to hijack the…

All CVEs affecting Iodata Etx-r Firmware →