CVE-2021-39274Public exploit

Root code execution via world-writable installation directory

Published Aug 19, 2021 · Updated Aug 4, 2024

Incorrect default permissions in XeroSecurity Sn1per 9.0 allow local users to execute arbitrary code with root privileges. The installer recursively applies mode 0777 to /usr/share/sniper, allowing any local account to replace the main script or alter sniper.conf, which the shell sources. Exploitation requires a later root invocation of Sn1per; the inserted commands then run as root, enabling complete host compromise.

CVSS severity9.8
Critical
EPSS probability3.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in XeroSecurity Sn1per 9.0 allow local users to execute arbitrary code with root privileges. The installer recursively applies mode 0777 to /usr/share/sniper, allowing any local account to replace the main script or alter sniper.conf, which the shell sources. Exploitation requires a later root invocation of Sn1per; the inserted commands then run as root, enabling complete host compromise.

The record

CVE
CVE-2021-39274
Published
Aug 19, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-276, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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