What is CVE-2017-18407?

CVE-2017-18407 is a medium-severity vulnerability in Cpanel, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.8/10. Published 2019-08-02.

How severe is CVE-2017-18407?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Cpanel

CVE-2017-18407

cPanel before 67.9999.103 does not enforce SSL hostname verification for the support-agreement download (SEC-279).

Published 2019-08-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Cpanel

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

documentation.cpanel.net/display/CL/68+Change+Log (Product, Release Notes)
news.cpanel.com/cpanel-tsr-2017-0005-full-disclosure/ (Vendor Advisory)

Frequently asked questions

What is CVE-2017-18407?: CVE-2017-18407 is a medium-severity vulnerability in Cpanel, classified under Improper Verification of Cryptographic Signature. CVSS score: 4.8/10. Published 2019-08-02.
How severe is CVE-2017-18407?: Medium severity. CVSS v3 base score is 4.8 out of 10.