What is CVE-2021-43711?

CVE-2021-43711 is a critical-severity vulnerability in Totolink Ex200, classified under Command Injection. CVSS score: 9.8/10. Published 2022-01-04.

How severe is CVE-2021-43711?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-43711 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Totolink Ex200

CVE-2021-43711

The downloadFlile.cgi binary file in TOTOLINK EX200 V4.0.3c.7646_B20201211 has a command injection vulnerability when receiving GET parameters. The parameter name can be constructed for unauthenticated command execution.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.363 (98.3th percentile) — read the EPSS interpretation.

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.

Affected products

Totolink Ex200
Totolink Ex200_firmware — versions 4.0.3c.7646_b20201211
N/a — versions n/a

Weakness classification (CWE)

CWE-77 — Command Injection

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-43711?: CVE-2021-43711 is a critical-severity vulnerability in Totolink Ex200, classified under Command Injection. CVSS score: 9.8/10. Published 2022-01-04.
How severe is CVE-2021-43711?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-43711 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.