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.

CVSS v3.1 NVD

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 NVD

9.0 HIGHAV:N/AC:L/Au:S/C:C/I:C/A:C

EPSS

4.32% chance of exploitation in the next 30 days, 91st percentile

Published

2021-09-01

Updated

2024-08-04

Proof-of-concept exploits (1)

• https://7bits.nl/journal/posts/cve-2021-38703-kpn-experia-wifi-root-shell/

Security advisories

• https://www.kpnwebshop.com/modems-routers/producten/experia-wifi/2
• https://7bits.nl/journal/posts/cve-2021-38703-kpn-experia-wifi-root-shell

References

• CVE Record
• NVD entry