THREATPORT/VULNERABILITY/CVE-2021-21804
CRITICAL SEVERITY

CVE-2021-21804

R Seenet vulnerability

CVSS
9.8
EPSS
3.7%
EPSS pct
89th
Exploited
No known
A local file inclusion (LFI) vulnerability exists in the options.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). A specially crafted HTTP request can lead to arbitrary PHP code execution. An attacker can send a crafted HTTP request to trigger this vulnerability.
Affected vendor
Advantech
Affected product
R Seenet
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-98 — PHP Remote File Inclusion
  • CWE-829 — Inclusion of Functionality from Untrusted Control Sphere
Published
2021-07-16

Risk analysis

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

Its EPSS score of 3.7% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2021-21804

  • Confirm whether Advantech R Seenet is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-21804.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-21804

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-21804 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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