RCE in Advantech R-Seenet

CVE-2021-21805

An OS Command Injection vulnerability exists in the ping.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). A specially crafted HTTP request can lead to arbitrary OS command execution. An attacker can send a crafted HTTP request to trigger this vulnerability.

Vulnerability class: Command Injection (OS Command Injection)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.698 (99.4th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-21805: held from 0.698 to 0.698.

EPSS over last 30 days · oldest: 0.698 · newest: 0.698 · change: 0.000

Affected products

  • Advantech R-Seenet — versions 2.4.12
  • Advantech — versions Advantech R-SeeNet 2.4.12 (20.10.2020)

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2021-21805?
CVE-2021-21805 is a critical-severity vulnerability in Advantech R-Seenet, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-08-05.
How severe is CVE-2021-21805?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-21805 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.