THREATPORT/VULNERABILITY/CVE-2021-21799
MEDIUM SEVERITY

CVE-2021-21799

R Seenet vulnerability

CVSS
6.1
EPSS
12.3%
EPSS pct
96th
Exploited
No known
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 of the targeted user’s browser. An attacker can provide a crafted URL to trigger this vulnerability.
Affected vendor
Advantech
Affected product
R Seenet
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness type (CWE)
  • CWE-79 — Cross-Site Scripting (XSS)
Published
2021-07-16

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality, low impact to integrity.

Its EPSS score of 12.3% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2021-21799

  • Confirm whether Advantech R Seenet is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-21799.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-21799

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-21799 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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