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Fencer Intel
high 7.8

CVE-2016-6252 json

Integer overflow in shadow 4.2.1 allows local users to gain privileges via crafted input to newuidmap.

published 2017-02-17 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7182

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

Integer overflow in shadow 4.2.1 allows local users to gain privileges via crafted input to newuidmap.

Patch / fix

  • shadow Debian 14, Debian 13, Debian 12 1:4.4-1

debian advisories DEBIAN-CVE-2016-6252

  • shadow Ubuntu 14.04 LTS 1:4.1.5.1-1ubuntu9.4
  • shadow Ubuntu 16.04 LTS 1:4.2-3.1ubuntu5.2

ubuntu advisories UBUNTU-CVE-2016-6252

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • shadow SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +5 more 4.2.1-27.9.1
  • shadow SLES for SAP 12 SP1, SLES 12-LTSS, SLES 12 SP1-LTSS 4.1.5.1-19.8.1

suse advisories SUSE-SU-2018:1997-2SUSE-SU-2018:1995-1SUSE-SU-2018:1997-1

  • shadow Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 4.2.1-r7

alpine advisories ALPINE-CVE-2016-6252

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-6252 updated cvss 5.3

shadow-utils: Incorrect integer handling results in LPE

  • Red Hat Enterprise Linux 5 shadow-utils Red Hat Enterprise Linux 6 shadow-utils Red Hat Enterprise Linux 7 shadow-utils
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel 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.