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CVE-2021-39273

27
FAUCET Score

CVE-2021-39273 describes an insecure permissions vulnerability (CWE-276) in XeroSecurity Sn1per 9.0 (free version), where the application sets 0777 permissions upon execution. This allows any unprivileged user to modify core application files, modules, and configurations, leading to arbitrary code execution with root privileges. Rated 8.8 HIGH on CVSS, this vulnerability has a low attack complexity and can be exploited remotely by a low-privileged attacker, resulting in high impact to confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
9.0CPE matchmatch criteria
cpe:2.3:a:xerosecurity:sn1per:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.67%
Probability of exploitation in next 30 days
EPSS Percentile
84.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0267 is in the 83rd percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 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

github.com / 1N3/Sn1per/issues/358
ExploitThird Party Advisory
github.com / 1N3/Sn1per/releases
Release NotesThird Party Advisory
github.com / nikip72/CVE-2021-39273-CVE-2021-39274
ExploitThird Party Advisory