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CVE Record

CVE-2021-39273: In XeroSecurity Sn1per 9.0 (free version), insecure permissions (0777) are set upon application execution,...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Sn1per 9.0 free version reportedly sets application, module, and configuration files to world-writable permissions when executed. A local unprivileged user could change those files and have malicious changes run with root privileges.

Executive priority

Treat this as a high-priority local privilege escalation risk where Sn1per is installed on shared or production-adjacent security infrastructure. Prioritize inventory and permission review before assuming a patch exists.

Technical view

CVE-2021-39273 describes insecure 0777 permissions in XeroSecurity Sn1per 9.0 free version after application execution. The stated impact is local privilege escalation to arbitrary code execution as root through modification of application, module, or configuration files.

Likely exposure

Exposure is likely limited to systems running Sn1per 9.0 free version, especially shared Linux hosts or security tool servers where unprivileged users can access the installation path.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Public references include GitHub release, issue, and CVE-named repository links, but the bundle does not prove exploitation in the wild.

Researcher notes

The CVE record gives the core vulnerability and impact, but the bundle lacks CVSS, CWE, detailed affected CPEs, and confirmed remediation. Validation should focus on reproducing the permission state without developing exploit procedures.

Mitigation direction

  • Check the Sn1per project releases and issue tracker for vendor guidance or fixed versions.
  • Remove broad write permissions from application, module, and configuration paths where safe.
  • Restrict local shell access to hosts running Sn1per.
  • Run Sn1per only on dedicated, controlled systems until vendor guidance is confirmed.
  • Review whether root execution is required and reduce privileges where operationally possible.

Validation and detection

  • Inventory systems for Sn1per 9.0 free version installations.
  • Inspect permissions on Sn1per application, module, and configuration files after execution.
  • Confirm whether unprivileged local users can modify Sn1per-controlled files.
  • Review recent file changes in Sn1per directories for unexpected modifications.
  • Check operational runbooks for root execution of Sn1per tasks.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-39273 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.