Vulnerability · Published Jul 16, 2021 · Assigned by talos

CVE-2021-21800

Critical 9.6

In plain English

A critical-severity cross-site scripting in Advantech. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 14.1% (higher than 97% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.0)9.6Critical

Exploit odds (30 days)14.1%top 3.4% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack tooling1Nuclei

Official description

Cross-site scripting vulnerabilities exist in the ssh_form.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). If a user visits a specially crafted URL, it can lead to arbitrary JavaScript code execution in the context of the targeted user’s browser. An attacker can provide a crafted URL to trigger this vulnerability.

Affected products (as reported)

Vendor	Product	Versions
n/a	Advantech	Advantech R-SeeNet 2.4.12 (20.10.2020)

Weakness: CWE-79 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1271 x_refsource_MISC