What is CVE-2020-11556?

CVE-2020-11556 is a medium-severity vulnerability in Castlerock Snmpc Online, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-04-09.

How severe is CVE-2020-11556?

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

XSS in Castlerock Snmpc Online

CVE-2020-11556

An issue was discovered in Castle Rock SNMPc Online 12.10.10 before 2020-01-28. There are multiple persistent (stored) and reflected XSS vulnerabilities.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-04-09 · 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: 0.006 (44.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Castlerock Snmpc Online

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

medium.com/tsscyber/noc-noc-whos-there-your-nms-is-pwned-1826174e0dee (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-11556?: CVE-2020-11556 is a medium-severity vulnerability in Castlerock Snmpc Online, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-04-09.
How severe is CVE-2020-11556?: Medium severity. CVSS v3 base score is 5.4 out of 10.