What is the CVSS score of CVE-2021-39278?

CVE-2021-39278 has a CVSS 3.1 base score of 6.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.9%.

Is there a public PoC exploit available for CVE-2021-39278?

Yes, a public proof-of-concept exploit is available for CVE-2021-39278. Prioritise patching immediately. EPSS: 0.9%.

Wac 2004 Firmware CVE-2021-39278

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2021-09-07 cve@mitre.org

XSS 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

6.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.1 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

CVE Published

Sep 07, 2021 - 06:15 nvd

MEDIUM 6.1

DescriptionNVD

Certain MOXA devices allow reflected XSS via the Config Import menu. 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 reflected XSS via the Config Import menu. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Certain MOXA devices allow reflected XSS via the Config Import menu. 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. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.