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Fencer Vulns
high 7.5

CVE-2017-9445 in the critical feed json

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small.

published 2017-06-28 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-18378

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
58.8%
EPSS 58.8% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small. A malicious DNS server can exploit this via a response with a specially crafted TCP payload to trick systemd-resolved into allocating a buffer that's too small, and subsequently write arbitrary data beyond the end of it.

Patch / fix

  • systemd Debian 14, Debian 13, Debian 12 233-10

debian advisories DEBIAN-CVE-2017-9445

  • systemd Ubuntu 16.04 LTS 229-4ubuntu19

ubuntu advisories UBUNTU-CVE-2017-9445

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

  • systemd SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 228-150.9.3
  • dracut SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 044.1-109.8.3
  • systemd SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 228-150.7.1

suse advisories SUSE-SU-2017:2031-1SUSE-SU-2017:1898-1

  • systemd openSUSE Tumbleweed 249.4-2.2

opensuse advisories openSUSE-SU-2024:11420-1

  • systemd Arch Linux 233-6

arch linux advisories AVG-329

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-2017-9445 updated cvss 7.5

systemd: Out-of-bounds write in systemd-resolved due to allocating too small buffer in dns_packet_new

  • Red Hat Enterprise Linux 7 systemd, libgudev1, systemd-libs, systemd-sysv, systemd-python, systemd-networkd, +2 more
    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

58.81% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/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 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.