What is the CVSS score of CVE-2021-39243?

CVE-2021-39243 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.5%.

Is there a public PoC exploit available for CVE-2021-39243?

Yes, a public proof-of-concept exploit is available for CVE-2021-39243. Prioritise patching immediately. EPSS: 0.5%.

Nexto Nx3003 Firmware CVE-2021-39243

MEDIUM

Cross-Site Request Forgery (CSRF) (CWE-352)

2021-08-23 cve@mitre.org

CSRF Nexto Nx3003 Firmware Nexto Nx3004 Firmware Nexto Nx3005 Firmware Nexto Nx3010 Firmware Nexto Nx3020 Firmware Nexto Nx3030 Firmware Nexto Nx5100 Firmware Nexto Nx5101 Firmware Nexto Nx5110 Firmware Nexto Nx5210 Firmware Nexto Xpress Xp300 Firmware Nexto Xpress Xp315 Firmware Nexto Xpress Xp325 Firmware Nexto Xpress Xp340 Firmware Hadron Xtorm Hx3040 Firmware

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

CVE Published

Aug 23, 2021 - 05:15 nvd

MEDIUM 6.5

DescriptionNVD

Cross-Site Request Forgery (CSRF) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via any CGI endpoint. This affects Nexto NX3003 1.8.11.0, Nexto NX3004 1.8.11.0, Nexto NX3005 1.8.11.0, Nexto NX3010 1.8.3.0, Nexto NX3020 1.8.3.0, Nexto NX3030 1.8.3.0, Nexto NX5100 1.8.11.0, Nexto NX5101 1.8.11.0, Nexto NX5110 1.1.2.8, Nexto NX5210 1.1.2.8, Nexto Xpress XP300 1.8.11.0, Nexto Xpress XP315 1.8.11.0, Nexto Xpress XP325 1.8.11.0, Nexto Xpress XP340 1.8.11.0, and Hadron Xtorm HX3040 1.7.58.0.

AnalysisAI

Cross-Site Request Forgery (CSRF) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via any CGI endpoint. Rated medium severity (CVSS 6.5), 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 Request Forgery (CSRF) (CWE-352), which allows attackers to trick authenticated users into performing unintended actions. Cross-Site Request Forgery (CSRF) exists on Altus Nexto, Nexto Xpress, and Hadron Xtorm devices via any CGI endpoint. This affects Nexto NX3003 1.8.11.0, Nexto NX3004 1.8.11.0, Nexto NX3005 1.8.11.0, Nexto NX3010 1.8.3.0, Nexto NX3020 1.8.3.0, Nexto NX3030 1.8.3.0, Nexto NX5100 1.8.11.0, Nexto NX5101 1.8.11.0, Nexto NX5110 1.1.2.8, Nexto NX5210 1.1.2.8, Nexto Xpress XP300 1.8.11.0, Nexto Xpress XP315 1.8.11.0, Nexto Xpress XP325 1.8.11.0, Nexto Xpress XP340 1.8.11.0, and Hadron Xtorm HX3040 1.7.58.0. Affected products include: Altus Nexto Nx3003 Firmware, Altus Nexto Nx3004 Firmware, Altus Nexto Nx3005 Firmware, Altus Nexto Nx3010 Firmware, Altus Nexto Nx3020 Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement anti-CSRF tokens, validate Origin/Referer headers, use SameSite cookie attribute.