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CVE-2016-6240

24
FAUCET Score

CVE-2016-6240 is an integer truncation error in the amap_alloc function of OpenBSD versions 5.8 and 5.9. This vulnerability allows a local attacker to achieve arbitrary code execution with kernel privileges by supplying a large size value. Rated 7.8 High on CVSS, it presents a significant risk due to its potential for full compromise (confidentiality, integrity, availability) with low attack complexity and no user interaction required. While no public exploits or active exploitation have been observed, and community discussion is minimal, the high severity warrants attention for affected systems.

Impacted Technologies

VendorProductVersion(s)CPE
5.8CPE matchmatch criteria
cpe:2.3:o:openbsd:openbsd:5.8:*:*:*:*:*:*:*
5.9CPE matchmatch criteria
cpe:2.3:o:openbsd:openbsd:5.9:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
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
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
44.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 84th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 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 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

openbsd.org / errata58.html
Release Notes
openbsd.org / errata59.html
Release Notes
openwall.com / lists/oss-security/2016/07/14/5
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2016/07/17/7
ExploitMailing ListThird Party Advisory
securityfocus.com / bid/91805
securitytracker.com / id/1036318