How severe is CVE-2021-39243?

CVE-2021-39243 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-39243 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39243?

CVE-2021-39243 primarily affects Altus Nexto Nx3003 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39243?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-39243 published?

CVE-2021-39243 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2021-39243

CVE-2021-39243 is a medium-severity vulnerability in Altus Nexto Nx3003 Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Altus Nexto Nx3003 Firmware
Published: 2021-08-23
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-39243?: 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.
How severe is CVE-2021-39243?: CVE-2021-39243 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-39243 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39243?: CVE-2021-39243 primarily affects Altus Nexto Nx3003 Firmware. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39243?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39243 published?: CVE-2021-39243 was published on 2021-08-23 and last updated on 2026-06-17.

References

Affected products (15)

cpe:2.3:o:altus:nexto_nx3003_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx3004_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx3005_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx3010_firmware:1.8.3.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx3020_firmware:1.8.3.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx3030_firmware:1.8.3.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx5100_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx5101_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx5110_firmware:1.1.2.8:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_nx5210_firmware:1.1.2.8:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_xpress_xp300_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_xpress_xp315_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_xpress_xp325_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:nexto_xpress_xp340_firmware:1.8.11.0:*:*:*:*:*:*:*
cpe:2.3:o:altus:hadron_xtorm_hx3040_firmware:1.7.58.0:*:*:*:*:*:*:*

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