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Fencer Intel
high 7.5

CVE-2016-4574 json

Off-by-one error in the append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.4 allows remote attackers to cause a deni…

published 2016-06-13 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-5560

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

Off-by-one error in the append_utf8_value function in the DN decoder (dn.c) in Libksba before 1.3.4 allows remote attackers to cause a denial of service (out-of-bounds read) via invalid utf-8 encoded data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-4356.

Patch / fix

  • libksba Debian 14, Debian 13, Debian 12 1.3.4-3

debian advisories DEBIAN-CVE-2016-4574

  • libksba Ubuntu 14.04 LTS 1.3.0-3ubuntu0.14.04.2
  • libksba Ubuntu 16.04 LTS 1.3.3-1ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-4574

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

  • libksba SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 1.3.0-23.1
  • libksba SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.0.4-1.25.1

suse advisories SUSE-SU-2016:1510-1SUSE-SU-2016:1509-1

  • libksba openSUSE Tumbleweed 1.3.5-1.3

opensuse advisories openSUSE-SU-2024:10126-1

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-2016-4574 updated cvss 5.1

libksba: Incomplete fix for CVE-2016-4356

  • Red Hat Enterprise Linux 5 libksba Red Hat Enterprise Linux 6 libksba Red Hat Enterprise Linux 7 libksba
    affected: no fix planned “Will not fix”

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

2.76% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

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.