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Fencer Vulns
high 7.8

CVE-2016-6253 json

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 arb…

published 2017-01-20 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7183

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
3
Metasploit, Exploit-DB

Summary

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.

Timeline

  1. First public exploit (Metasploit exploit/unix/local/netbsd_mail_local)
  2. Published

Exploit prediction

3.53% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/unix/local/netbsd_mail_local NetBSD mail.local Privilege Escalation metasploit exploit, great rank, 2016-07-07
  • EDB-40385 NetBSD - 'mail.local(8)' Local Privilege Escalation (Metasploit) local, 2016-09-15
  • EDB-40141 NetBSD - 'mail.local(8)' Local Privilege Escalation local, 2016-07-21
  • packetstormsecurity.com http://packetstormsecurity.com/files/138021/NetBSD-mail.local-8-Local-Root.html referenced PoC, tagged "exploit" by a source, unverified
  • akat1.pl http://akat1.pl/?id=2 referenced PoC, tagged "exploit" by a source, unverified
  • rapid7.com http://www.rapid7.com/db/modules/exploit/unix/local/netbsd_mail_local referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.