What is CVE-2023-39575?

CVE-2023-39575 is a medium-severity vulnerability in Isl Arp-Guard, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-20.

How severe is CVE-2023-39575?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Isl Arp-Guard

CVE-2023-39575

A reflected cross-site scripting (XSS) vulnerability in the url_str URL parameter of ISL ARP Guard v4.0.2 allows attackers to execute arbitrary web scripts or HTML via a crafted payload.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (32.4th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Isl Arp-Guard

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

evait.medium.com/discovery-of-a-reflective-xss-vulnerability-in-arp-guard-softw… (Technical Description, Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2023-39575?: CVE-2023-39575 is a medium-severity vulnerability in Isl Arp-Guard, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2023-09-20.
How severe is CVE-2023-39575?: Medium severity. CVSS v3 base score is 5.4 out of 10.