CVE-2016-6253

Exp

mail.local in NetBSD versions 6.0 through 6.0.6, 6.1 through 6.1.5, and 7.0 allows local users to change ownership of or append data to arbitrary files on the target system via a symlink attack on the user mailbox.

Published: 2017-01-20 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-6253 is rated High Exploit Risk (73.1/100): CVSS High severity, with high exploitation likelihood (EPSS 7.27%, 91th percentile). 7 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2016-6253

EDB-ID Source Kind Published Link
40385 exploit_db edb 2016-09-15 Exploit-DB ↗
40141 exploit_db edb 2016-07-21 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2016-6253

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 2025-10-05 13.70% 7.27% -6.43%
2 2025-09-23 14.95% 13.70% -1.26%
3 2025-07-30 — 14.95% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-6253

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/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:L)
A normal user session is enough; they don’t have to be admin.
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.
 1.8 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-2016-6253

Affected software / configurations for CVE-2016-6253

Vendor Product Version Raw CPE
netbsd netbsd 6.0 cpe:2.3:o:netbsd:netbsd:6.0:*:*:*:*:*:*:*
netbsd netbsd 6.0.1 cpe:2.3:o:netbsd:netbsd:6.0.1:*:*:*:*:*:*:*
netbsd netbsd 6.0.2 cpe:2.3:o:netbsd:netbsd:6.0.2:*:*:*:*:*:*:*
netbsd netbsd 6.0.3 cpe:2.3:o:netbsd:netbsd:6.0.3:*:*:*:*:*:*:*
netbsd netbsd 6.0.4 cpe:2.3:o:netbsd:netbsd:6.0.4:*:*:*:*:*:*:*
netbsd netbsd 6.0.5 cpe:2.3:o:netbsd:netbsd:6.0.5:*:*:*:*:*:*:*
netbsd netbsd 6.0.6 cpe:2.3:o:netbsd:netbsd:6.0.6:*:*:*:*:*:*:*
netbsd netbsd 6.1 cpe:2.3:o:netbsd:netbsd:6.1:*:*:*:*:*:*:*
netbsd netbsd 6.1.1 cpe:2.3:o:netbsd:netbsd:6.1.1:*:*:*:*:*:*:*
netbsd netbsd 6.1.2 cpe:2.3:o:netbsd:netbsd:6.1.2:*:*:*:*:*:*:*
netbsd netbsd 6.1.3 cpe:2.3:o:netbsd:netbsd:6.1.3:*:*:*:*:*:*:*
netbsd netbsd 6.1.4 cpe:2.3:o:netbsd:netbsd:6.1.4:*:*:*:*:*:*:*
netbsd netbsd 6.1.5 cpe:2.3:o:netbsd:netbsd:6.1.5:*:*:*:*:*:*:*
netbsd netbsd 7.0 cpe:2.3:o:netbsd:netbsd:7.0:*:*:*:*:*:*:*

References for CVE-2016-6253

URL Tags
http://akat1.pl/?id=2 Exploit Third Party Advisory
http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2016-006.txt.asc Vendor Advisory
http://packetstormsecurity.com/files/138021/NetBSD-mail.local-8-Local-Root.html Exploit Third Party Advisory VDB Entry
http://www.rapid7.com/db/modules/exploit/unix/local/netbsd_mail_local Exploit Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/92101 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1036429 Third Party Advisory VDB Entry
https://www.exploit-db.com/exploits/40141/ Exploit Third Party Advisory VDB Entry
https://www.exploit-db.com/exploits/40385/ Exploit Third Party Advisory VDB Entry
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