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CVE-2023-4104

20
FAUCET Score

CVE-2023-4104 is a medium-severity vulnerability affecting Mozilla VPN on Linux versions 2.16.1 and earlier. It stems from an invalid Polkit authentication check and missing authentication for D-Bus methods, allowing any local user to configure arbitrary VPN setups. The vulnerability has a CVSS score of 5.5, indicating a local attack vector with low complexity, requiring no user interaction, and potentially leading to high integrity impact. While there is no evidence of active exploitation, no public exploit code, and it is not listed in CISA's KEV catalog, it has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.16.1CPE matchmatch criteria
cpe:2.3:a:mozilla:vpn:*:*:*:*:*:linux:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.35%
Probability of exploitation in next 30 days
EPSS Percentile
27.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0035 is in the 84th percentile among its peer group of 15,938 CVEs.

Social Chatter

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

Media Mentions

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 (2)

github_advisorypatch availablevia nvd_reference
View patch
mozillavendor investigatingvia nvd_reference
View patch

References

bugzilla.mozilla.org / show_bug.cgi
ExploitIssue Tracking
github.com / mozilla-mobile/mozilla-vpn-client/pull/7055
Issue TrackingPatch
github.com / mozilla-mobile/mozilla-vpn-client/pull/7110
Issue TrackingPatch
github.com / mozilla-mobile/mozilla-vpn-client/pull/7151
Issue Tracking
mozilla.org / security/advisories/mfsa2023-39
Vendor Advisory
openwall.com / lists/oss-security/2023/08/03/1
ExploitMailing ListThird Party Advisory