What is the CVSS score of CVE-2021-39279?

CVE-2021-39279 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 4.6%.

Is there a public PoC exploit available for CVE-2021-39279?

Yes, a public proof-of-concept exploit is available for CVE-2021-39279. Prioritise patching immediately. EPSS: 4.6%.

Wac 2004 Firmware CVE-2021-39279

HIGH

OS Command Injection (CWE-78)

2021-09-07 cve@mitre.org

Command Injection Wac 2004 Firmware Wac 1001 Firmware Wac 1001 T Firmware Oncell G3470A Lte Eu Firmware Oncell G3470A Lte Eu T Firmware Tap 323 Eu Ct T Firmware Tap 323 Us Ct T Firmware Tap 323 Jp Ct T Firmware Wdr 3124A Eu Firmware Wdr 3124A Eu T Firmware Wdr 3124A Us Firmware Wdr 3124A Us T Firmware

8.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

8.8 HIGH

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Sep 07, 2021 - 06:15 nvd

HIGH 8.8

DescriptionNVD

Certain MOXA devices allow Authenticated Command Injection via /forms/web_importTFTP. This affects WAC-2004 1.7, WAC-1001 2.1, WAC-1001-T 2.1, OnCell G3470A-LTE-EU 1.7, OnCell G3470A-LTE-EU-T 1.7, TAP-323-EU-CT-T 1.3, TAP-323-US-CT-T 1.3, TAP-323-JP-CT-T 1.3, WDR-3124A-EU 2.3, WDR-3124A-EU-T 2.3, WDR-3124A-US 2.3, and WDR-3124A-US-T 2.3.

AnalysisAI

Certain MOXA devices allow Authenticated Command Injection via /forms/web_importTFTP. Rated high severity (CVSS 8.8), 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. Certain MOXA devices allow Authenticated Command Injection via /forms/web_importTFTP. This affects WAC-2004 1.7, WAC-1001 2.1, WAC-1001-T 2.1, OnCell G3470A-LTE-EU 1.7, OnCell G3470A-LTE-EU-T 1.7, TAP-323-EU-CT-T 1.3, TAP-323-US-CT-T 1.3, TAP-323-JP-CT-T 1.3, WDR-3124A-EU 2.3, WDR-3124A-EU-T 2.3, WDR-3124A-US 2.3, and WDR-3124A-US-T 2.3. Affected products include: Moxa Wac-2004 Firmware, Moxa Wac-1001 Firmware, Moxa Wac-1001-T Firmware, Moxa Oncell G3470A-Lte-Eu Firmware, Moxa Oncell G3470A-Lte-Eu-T 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.