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Fencer Intel
medium 5.9

CVE-2016-7069 json

An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend.

published 2018-09-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7949

cvss
5.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
4.6%
EPSS 4.6% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.

Patch / fix

  • dnsdist Debian 14, Debian 13, Debian 12 1.2.0-1

debian advisories DEBIAN-CVE-2016-7069

  • dnsdist SLE Module for Basesystem 15 SP5, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.5 +1 more 1.8.0-150400.9.3.1
  • luajit SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +5 more 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1
  • dnsdist SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES 15 SP3-LTSS +2 more 1.8.0-150100.3.5.1

suse advisories SUSE-SU-2023:2760-1SUSE-SU-2023:2760-2SUSE-SU-2023:2777-1

  • dnsdist openSUSE Tumbleweed 1.8.0~rc1-1.1

opensuse advisories openSUSE-SU-2024:12731-1

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-2016-7069 updated cvss 5.9

dnsdist: Crafted backend responses can cause a denial of service

  • Red Hat All currently supported Red Hat products
    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

4.58% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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

Affected products

  • Open-Xchange dnsdist

Classification

Weakness
  • CWE-20 Improper Input Validation

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.