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CVE-2023-39004

32
FAUCET Score

CVE-2023-39004 is a critical vulnerability affecting OPNsense Community Edition before 23.7 and Business Edition before 23.4.2, stemming from insecure permissions in the /conf/ directory. This allows unauthenticated attackers to access sensitive information, such as hashed root passwords, potentially leading to full system compromise and privilege escalation. With a CVSS score of 9.8 (CRITICAL), it is easily exploitable over the network with no user interaction, resulting in high confidentiality, integrity, and availability impacts. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< 23.7CPE matchmatch criteria
cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.78%
Probability of exploitation in next 30 days
EPSS Percentile
52.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0078 is in the 36th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

logicaltrust.net / blog/2023/08/opnsense.html
ExploitThird Party Advisory