What is CVE-2021-21800?

CVE-2021-21800 is a medium-severity vulnerability in Advantech R-Seenet, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-16.

How severe is CVE-2021-21800?

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

Is CVE-2021-21800 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Advantech R-Seenet

CVE-2021-21800

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.141 (96.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Advantech R-seenet — versions 2.4.12
N/a Advantech — versions Advantech R-SeeNet 2.4.12 (20.10.2020)

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

talos-cna@cisco.com (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-21800?: CVE-2021-21800 is a medium-severity vulnerability in Advantech R-Seenet, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-16.
How severe is CVE-2021-21800?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-21800 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.