How severe is CVE-2021-39273?

CVE-2021-39273 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39273 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39273?

CVE-2021-39273 affects Xerosecurity Sn1per. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39273?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39273 published?

CVE-2021-39273 was published on 2021-08-19 and last updated on 2026-06-17.

CVE-2021-39273

CVE-2021-39273 is a high-severity vulnerability in Xerosecurity Sn1per with a CVSS 3.x base score of 8.8. 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-276.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Xerosecurity Sn1per
Published: 2021-08-19
Last modified: 2026-06-17

Description

In XeroSecurity Sn1per 9.0 (free version), insecure permissions (0777) are set upon application execution, allowing an unprivileged user to modify the application, modules, and configuration files. This leads to arbitrary code execution with root privileges.

Frequently asked questions

What is CVE-2021-39273?: In XeroSecurity Sn1per 9.0 (free version), insecure permissions (0777) are set upon application execution, allowing an unprivileged user to modify the application, modules, and configuration files. This leads to arbitrary code execution with root privileges.
How severe is CVE-2021-39273?: CVE-2021-39273 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39273 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39273?: CVE-2021-39273 affects Xerosecurity Sn1per. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39273?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39273 published?: CVE-2021-39273 was published on 2021-08-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xerosecurity:sn1per:9.0:*:*:*:*:*:*:*

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