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CVE-2018-4020

49
FAUCET Score

CVE-2018-4020 is a high-severity command injection vulnerability affecting Netgate pfSense CE 2.4.4-RELEASE. An authenticated attacker can exploit a flaw in the processing of the powerd_ac_mode POST parameter to execute arbitrary commands on the system. This vulnerability has a CVSS score of 7.2, indicating high impact on confidentiality, integrity, and availability, and a high EPSS score suggests a significant likelihood of exploitation. While no public exploit code or active exploitation has been observed, its high FAUCET Risk Score and the requirement for authenticated access highlight the potential for a targeted attack.

Impacted Technologies

VendorProductVersion(s)CPE
2.4.4CPE matchmatch criteria
cpe:2.3:a:netgate:pfsense:2.4.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.2HIGH

CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
48.72%
Probability of exploitation in next 30 days
EPSS Percentile
98.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.4872 is in the 98th percentile among its peer group of 5,531 CVEs.

Social Chatter

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

talosintelligence.com / vulnerability_reports/TALOS-2018-0690
ExploitThird Party Advisory