CVE-2021-38703 json
Wireless devices running certain Arcadyan-derived firmware (such as KPN Experia WiFi 1.00.15) do not properly sanitise user input to the sy…
published 2021-09-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-25141
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.3%
- EPSS 4.3% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
4.32% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- 7bits.nl https://7bits.nl/journal/posts/cve-2021-38703-kpn-experia-wifi-root-shell/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
References
-
7bits.nl
/journal/posts/cve-2021-38703-kpn-experia-wifi-root-shell/
exploit, third-party-advisory
-
kpnwebshop.com
/modems-routers/producten/experia-wifi/2
vendor-advisory
Sources
- CVE List CVE-2021-38703
- NVD CVE-2021-38703
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