Which products and versions are affected by CVE-2021-43711?

Affected: Ex200 Firmware (Totolink) versions 4.0.3c.7646_b20201211. The full list is in the CVE brief.

Is CVE-2021-43711 being exploited in the wild?

It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Aug 19, 2022.

Is CVE-2021-43711 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-43711?

No public exploit code is known.

Is there a fix for CVE-2021-43711?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-43711 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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WatchlistCritical

CVE-2021-43711Ex200 Firmware Command Injection

The downloadFlile.cgi binary file in TOTOLINK EX200 V4.0.3c.7646_B20201211 has a command injection vulnerability when receiving GET parameters.

Published Jan 4, 2022 · Updated Nov 21, 2024

Key Facts

Patch immediately

CVE-2021-43711 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Ex200 Firmware (Totolink).
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Aug 19, 2022. No public exploit code is known.
EPSS estimates a 38% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Scores

CVSS v3.1

9.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

38%

Higher than 98.5% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

38/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Aug 19, 2022

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Description

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CIRCL KEV	Aug 19, 2022	n/a	Not reported
Industry KEV feed	Aug 19, 2022	n/a	Not reported

Affected Products

1 affected entries in total

Product	Affected versions	Fixed in
Ex200 FirmwareTotolink	4.0.3c.7646_b20201211	n/a

Timeline

Publicly disclosed
Jan 4, 2022
Added to CIRCL KEV
Aug 19, 2022
Added to Industry KEV feed
Aug 19, 2022
Last updated
Nov 21, 2024

Weakness Type

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')

References

5 more references in the full CVE brief

FAQ

Common Questions.

The downloadFlile.cgi binary file in TOTOLINK EX200 V4.0.3c.7646_B20201211 has a command injection vulnerability when receiving GET parameters.
Affected: Ex200 Firmware (Totolink) versions 4.0.3c.7646_b20201211. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Aug 19, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-43711 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.