What is CVE-2017-8920?

CVE-2017-8920 is a medium-severity vulnerability in Cgiirc Cgi\, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-06-06.

How severe is CVE-2017-8920?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Cgiirc Cgi\

CVE-2017-8920

irc.cgi in CGI:IRC before 0.5.12 reflects user-supplied input from the R parameter without proper output encoding, aka XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-06-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.9th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Cgiirc Cgi\ — versions irc
Cgiirc Cgi\:irc

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cgiirc.org/ (Vendor Advisory)
github.com/dgl/cgiirc/commit/46dd48442204207b52c16065ad67d294194afd8d (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2017-8920?: CVE-2017-8920 is a medium-severity vulnerability in Cgiirc Cgi\, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2017-06-06.
How severe is CVE-2017-8920?: Medium severity. CVSS v3 base score is 6.1 out of 10.