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TI-2017-06857 Aliases CVE-2017-9445GHSA-42xm-66qf-5jj8

In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can…

Priority HIGH 66CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

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.

Why it matters now

EPSS 0.54837 99th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:*223 – 233Vulnerablesystemd
  • cpe:2.3:a:systemd_project:systemd:*:*:*:*:*:*:*:* Versions 223 – 233 Vulnerable ·systemd

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-9445
  2. 2026-10-03 Alias added: GHSA-42xm-66qf-5jj8
  3. 2026-10-07 EPSS moved to the 99th percentile and above

References

Patch 1

Other 1

  • TI-2023-11736 systemd before 247 does not adequately block local privilege escalation for some Sudo… CVSS 3.1HIGH 7.8
  • TI-2026-29031 In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file. CVSS 3.1MEDIUM 6.4
  • TI-2022-04038 Information disclosure in systemd CVSS 3.1MEDIUM 5.5
  • TI-2025-04111 Systemd-coredump: race condition that allows a local attacker to crash a suid program and… CVSS 3.1MEDIUM 4.7
  • TI-2017-11647 In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS… CVSS 3.1HIGH 7.5
  • TI-2026-29033 In systemd 259, systemd-journald can send ANSI escape sequences to the terminals of… CVSS 3.1LOW 3.3
See all 54 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences