How severe is CVE-2021-38703?

CVE-2021-38703 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-38703 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-38703?

CVE-2021-38703 affects Kpn Experia Wifi Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-38703?

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-2021-38703 published?

CVE-2021-38703 was published on 2021-09-01 and last updated on 2026-06-17.

CVE-2021-38703

CVE-2021-38703 is a high-severity vulnerability in Kpn Experia Wifi 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: 9.0
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Kpn Experia Wifi Firmware
Published: 2021-09-01
Last modified: 2026-06-17

Description

Wireless devices running certain Arcadyan-derived firmware (such as KPN Experia WiFi 1.00.15) do not properly sanitise user input to the syslog configuration form. An authenticated remote attacker could leverage this to alter the device configuration and achieve remote code execution. This can be exploited in conjunction with CVE-2021-20090.

Frequently asked questions

What is CVE-2021-38703?: Wireless devices running certain Arcadyan-derived firmware (such as KPN Experia WiFi 1.00.15) do not properly sanitise user input to the syslog configuration form. An authenticated remote attacker could leverage this to alter the device configuration and achieve remote code execution. This can be exploited in conjunction with CVE-2021-20090.
How severe is CVE-2021-38703?: CVE-2021-38703 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-38703 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-38703?: CVE-2021-38703 affects Kpn Experia Wifi Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-38703?: 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-2021-38703 published?: CVE-2021-38703 was published on 2021-09-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:kpn:experia_wifi_firmware:1.00.15:*:*:*:*:*:*:*