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TI-2021-04844 Aliases CVE-2021-21799GHSA-4jqw-vm5q-2f6h

Cross-site scripting in Advantech

Priority MEDIUM 41CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

EPSS 0.12293 96th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—AdvantechAdvantech R-SeeNet 2.4.12 (20.10.2020)—No fix listedCNA
  • Advantech Vendor— Affected Advantech R-SeeNet 2.4.12 (20.10.2020) Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:advantech:r-seenet:2.4.12:*:*:*:*:*:*:*2.4.12VulnerableAdvantech
  • cpe:2.3:a:advantech:r-seenet:2.4.12:*:*:*:*:*:*:* Versions 2.4.12 Vulnerable ·Advantech

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21799
  2. 2026-10-03 Alias added: GHSA-4jqw-vm5q-2f6h

References

Exploit 1

  • TI-2023-05193 Advantech R-SeeNet Unauthenticated Read/Write CVSS 3.1CRITICAL 9.8
  • TI-2021-04850 OS command injection in Advantech CVSS 3.1CRITICAL 9.8
  • TI-2021-04846 Cross-site scripting in Advantech CVSS 3.1MEDIUM 6.1
  • TI-2022-03130 Stack-based buffer overflow in Advantech R-SeeNet CVSS 3.1CRITICAL 9.8
  • TI-2022-03129 Stack-based buffer overflow in Advantech R-SeeNet CVSS 3.1CRITICAL 9.8
  • TI-2023-02441 Advantech R-SeeNet Use of Hard-coded Credentials CVSS 3.1CRITICAL 9.8
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences