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CVE-2018-12027

26
FAUCET Score

CVE-2018-12027 is an Insecure Permissions vulnerability in Phusion Passenger versions 5.3.x before 5.3.2. It allows a non-application user to redirect traffic to their own process by manipulating parent directories of a Unix domain socket, leading to information disclosure. With a CVSS score of 8.8 (HIGH), this vulnerability is easily exploitable over the network with low privileges, potentially resulting in high impact to confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.3.0, < 5.3.2CPE matchmatch criteria
cpe:2.3:a:phusion:passenger:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/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
3.0

Exploit Intelligence

EPSS Score
1.09%
Probability of exploitation in next 30 days
EPSS Percentile
61.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0109 is in the 58th percentile among its peer group of 17,823 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

Patch Available

Vendor Patches (1)

rubygemspatch availablevia ghsa
Product: passengerFixed in: 5.3.2

Vendor Advisories (2)

rubygemsGHSA-whfx-877c-5p28high

Insecure Permissions in Phusion Passenger

May 13, 2022
redhatCVE-2018-12027Moderate

passenger: Insecure permissions in SpawningKit can allow for redirection of traffic under certain configurations

Jun 5, 2018

References

blog.phusion.nl / passenger-5-3-2
MitigationVendor Advisory
security.gentoo.org / glsa/201807-02
Third Party Advisory