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CVE-2021-39243

22
FAUCET Score

CVE-2021-39243 describes a Cross-Site Request Forgery (CSRF) vulnerability present in Altus Nexto, Nexto Xpress, and Hadron Xtorm devices, impacting various models and firmware versions. This medium-severity vulnerability (CVSS 6.5) allows an unauthenticated attacker to manipulate affected devices through user interaction, potentially leading to high integrity impact without affecting confidentiality or availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.8.11.0CPE matchmatch criteria
cpe:2.3:o:altus:nexto_nx3003_firmware:1.8.11.0:*:*:*:*:*:*:*
1.8.11.0CPE matchmatch criteria
cpe:2.3:o:altus:nexto_nx3004_firmware:1.8.11.0:*:*:*:*:*:*:*
1.8.11.0CPE matchmatch criteria
cpe:2.3:o:altus:nexto_nx3005_firmware:1.8.11.0:*:*:*:*:*:*:*
1.8.3.0CPE matchmatch criteria
cpe:2.3:o:altus:nexto_nx3010_firmware:1.8.3.0:*:*:*:*:*:*:*
1.8.3.0CPE matchmatch criteria
cpe:2.3:o:altus:nexto_nx3020_firmware:1.8.3.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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 Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 44th percentile among its peer group of 26,208 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

seclists.org / fulldisclosure/2021/Aug/21
ExploitMailing ListThird Party Advisory
altus.com.br
Vendor Advisory