What is the CVSS score of CVE-2021-21819?

CVE-2021-21819 has a CVSS 3.1 base score of 7.2 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 2.9%.

Is there a public PoC exploit available for CVE-2021-21819?

Yes, a public proof-of-concept exploit is available for CVE-2021-21819. Prioritise patching immediately. EPSS: 2.9%.

Dir 3040 Firmware CVE-2021-21819

HIGH

OS Command Injection (CWE-78)

2021-07-16 talos-cna@cisco.com

D-Link RCE Command Injection Dir 3040 Firmware

7.2

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.2 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Jul 16, 2021 - 11:15 nvd

HIGH 7.2

DescriptionNVD

A code execution vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to arbitrary command execution. An attacker can send a sequence of requests to trigger this vulnerability.

AnalysisAI

A code execution vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. Rated high severity (CVSS 7.2), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. A code execution vulnerability exists in the Libcli Test Environment functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to arbitrary command execution. An attacker can send a sequence of requests to trigger this vulnerability. Affected products include: Dlink Dir-3040 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.