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CVE-2016-1821

39
FAUCET Score

CVE-2016-1821 is a critical vulnerability in IOAudioFamily within Apple OS X versions prior to 10.11.5, allowing attackers to execute arbitrary code with elevated privileges or trigger a denial of service via a crafted application. This vulnerability carries a high CVSS score of 7.8, indicating a significant risk due to its local attack vector, low attack complexity, and potential for high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or Metasploit/Nuclei modules, a proof-of-concept for a NULL pointer dereference is available on ExploitDB, though community discussion and media coverage are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
<= 10.11.4CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.75%
Probability of exploitation in next 30 days
EPSS Percentile
90.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-39926 · Jun 10, 2016
This CVE's current EPSS score of 0.0474 is in the 92nd percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 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

Vendor Patches (1)

applevendor investigatingvia nvd_reference
View patch

References

lists.apple.com / archives/security-announce/2016/May/msg00004.html
Vendor Advisory
bugs.chromium.org / p/project-zero/issues/detail
Exploit
support.apple.com / HT206567
Vendor Advisory
exploit-db.com / exploits/39926
ExploitThird Party AdvisoryVDB Entry
securityfocus.com / bid/90696
Third Party AdvisoryVDB Entry
securitytracker.com / id/1035895
Third Party AdvisoryVDB Entry