What is CVE-2021-21805?

CVE-2021-21805 is a critical-severity vulnerability in Advantech, 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.

RCE in Advantech

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…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.929 (99.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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-78 — OS Command Injection

Public proof-of-concept exploits

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1274 (x_refsource_MISC)

Frequently asked questions

What is CVE-2021-21805?: CVE-2021-21805 is a critical-severity vulnerability in Advantech, 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.