What is CVE-2021-21799?

CVE-2021-21799 is a critical-severity vulnerability in Advantech, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-07-16.

How severe is CVE-2021-21799?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2021-21799 known to be exploited?

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

XSS in Advantech

CVE-2021-21799

Cross-site scripting vulnerabilities exist in the telnet_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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.731 (98.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

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

talosintelligence.com/vulnerability_reports/TALOS-2021-1270 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-21799?: CVE-2021-21799 is a critical-severity vulnerability in Advantech, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-07-16.
How severe is CVE-2021-21799?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2021-21799 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.