What is CVE-2021-31726?

CVE-2021-31726 is a critical-severity vulnerability in Akuvox C315, classified under Command Injection. CVSS score: 9.8/10. Published 2021-04-25.

How severe is CVE-2021-31726?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Akuvox C315

CVE-2021-31726

Akuvox C315 115.116.2613 allows remote command Injection via the cfgd_server service. The attack vector is sending a payload to port 189 (default root 0.0.0.0).

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-04-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Akuvox C315
Akuvox C315 Firmware — versions 115.116.2613

Weakness classification (CWE)

CWE-77 — Command Injection

References

www.akuvox.com/ProductsDisp.aspx (Vendor Advisory)
pastebin.com/yv4ajFjD (Third Party Advisory)

Frequently asked questions

What is CVE-2021-31726?: CVE-2021-31726 is a critical-severity vulnerability in Akuvox C315, classified under Command Injection. CVSS score: 9.8/10. Published 2021-04-25.
How severe is CVE-2021-31726?: Critical severity. CVSS v3 base score is 9.8 out of 10.