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PatchSiren cyber security CVE debrief

CVE-2017-5616 cPanel CVE debrief

CVE-2017-5616 is a cross-site scripting (XSS) issue in cPanel's cgiemail and cgiecho CGI programs. According to the NVD record and the cPanel vendor advisory, a remote attacker could inject arbitrary web script or HTML through the addendum parameter. The CVE was published on 2017-03-03, with public references including an oss-security mailing list post and the vendor disclosure.

Vendor
cPanel
Product
Unknown
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2017-03-03
Original CVE updated
2026-05-13
Advisory published
2017-03-03
Advisory updated
2026-05-13

Who should care

Administrators and operators responsible for cPanel hosts that expose cgiemail or cgiecho, especially on internet-facing systems where users can reach the affected CGI endpoints.

Technical summary

NVD classifies the issue as CWE-79 with CVSS 3.0 vector CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. That means the bug is reachable over the network, requires no privileges, needs user interaction, and can allow script or HTML injection that may impact confidentiality and integrity in the browser context of a victim. The affected CPE entries in the NVD record are cpanel:cgiemail and cpanel:cgiecho.

Defensive priority

Medium. Treat as a priority if the affected CGI endpoints are exposed or still in use, because successful exploitation depends on user interaction but can still lead to phishing, content injection, or session-related abuse in a browser context.

Recommended defensive actions

  • Review the cPanel vendor advisory and apply the vendor-recommended remediation for cgiemail and cgiecho.
  • Inventory systems using cgiemail or cgiecho and confirm whether those CGI programs are still needed; disable or remove them if they are not required.
  • Restrict exposure of the affected CGI endpoints to the smallest possible audience.
  • Validate that application output is properly encoded and that untrusted input cannot be reflected into HTML or script contexts.
  • Monitor web and application logs for requests containing suspicious addendum parameter values or unexpected HTML/script output.

Evidence notes

This debrief is based on the supplied NVD record, which lists the vulnerability as CWE-79 XSS affecting cpanel:cgiemail and cpanel:cgiecho, and on the supplied references to the oss-security mailing list post and the cPanel vendor advisory. The published CVE date used here is 2017-03-03; the later modified timestamp was not treated as the issue date.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-5616 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-5616

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2017-5616 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-5616

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.