CVE-2016-8661

Little Snitch version 3.0 through 3.6.1 suffer from a buffer overflow vulnerability that could be locally exploited which could lead to an escalation of privileges (EoP) and unauthorised ring0 access to the operating system. The buffer overflow is related to insufficient checking of parameters to the "OSMalloc" and "copyin" kernel API calls.

Published: 2016-11-15 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-8661 is rated Moderate Risk (45.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.42%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-8661

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.08% 0.42% +0.34%
2 2023-03-07 0.89% 0.08% -0.81%
3 2022-02-04 — 0.89% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-8661

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.4 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.5 5.9 [email protected]
7.2 2.0 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2016-8661

Affected software / configurations for CVE-2016-8661

Vendor Product Version Raw CPE
obdev little_snitch 3.0 cpe:2.3:a:obdev:little_snitch:3.0:*:*:*:*:*:*:*
obdev little_snitch 3.0.1 cpe:2.3:a:obdev:little_snitch:3.0.1:*:*:*:*:*:*:*
obdev little_snitch 3.0.2 cpe:2.3:a:obdev:little_snitch:3.0.2:*:*:*:*:*:*:*
obdev little_snitch 3.0.3 cpe:2.3:a:obdev:little_snitch:3.0.3:*:*:*:*:*:*:*
obdev little_snitch 3.0.4 cpe:2.3:a:obdev:little_snitch:3.0.4:*:*:*:*:*:*:*
obdev little_snitch 3.1 cpe:2.3:a:obdev:little_snitch:3.1:*:*:*:*:*:*:*
obdev little_snitch 3.1.1 cpe:2.3:a:obdev:little_snitch:3.1.1:*:*:*:*:*:*:*
obdev little_snitch 3.3 cpe:2.3:a:obdev:little_snitch:3.3:*:*:*:*:*:*:*
obdev little_snitch 3.3.1 cpe:2.3:a:obdev:little_snitch:3.3.1:*:*:*:*:*:*:*
obdev little_snitch 3.3.2 cpe:2.3:a:obdev:little_snitch:3.3.2:*:*:*:*:*:*:*
obdev little_snitch 3.3.3 cpe:2.3:a:obdev:little_snitch:3.3.3:*:*:*:*:*:*:*
obdev little_snitch 3.3.4 cpe:2.3:a:obdev:little_snitch:3.3.4:*:*:*:*:*:*:*
obdev little_snitch 3.4 cpe:2.3:a:obdev:little_snitch:3.4:*:*:*:*:*:*:*
obdev little_snitch 3.4.1 cpe:2.3:a:obdev:little_snitch:3.4.1:*:*:*:*:*:*:*
obdev little_snitch 3.4.2 cpe:2.3:a:obdev:little_snitch:3.4.2:*:*:*:*:*:*:*
obdev little_snitch 3.5 cpe:2.3:a:obdev:little_snitch:3.5:*:*:*:*:*:*:*
obdev little_snitch 3.5.1 cpe:2.3:a:obdev:little_snitch:3.5.1:*:*:*:*:*:*:*
obdev little_snitch 3.5.2 cpe:2.3:a:obdev:little_snitch:3.5.2:*:*:*:*:*:*:*
obdev little_snitch 3.5.3 cpe:2.3:a:obdev:little_snitch:3.5.3:*:*:*:*:*:*:*
obdev little_snitch 3.6 cpe:2.3:a:obdev:little_snitch:3.6:*:*:*:*:*:*:*
obdev little_snitch 3.6.1 cpe:2.3:a:obdev:little_snitch:3.6.1:*:*:*:*:*:*:*

References for CVE-2016-8661

cvelogic Threat Intelligence