CVE-2017-9445: n/a vulnerability

CVE-2017-9445: In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 17:11 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-9445 is a memory corruption flaw in systemd-resolved through systemd 233. A malicious DNS server can send a crafted TCP DNS response that causes the resolver to allocate too small a buffer and write past its end. Treat affected Linux systems as potentially exposed where systemd-resolved is enabled. Likely exposure is Linux systems running systemd-resolved in systemd versions through 233. Risk is most relevant when hosts use or can be redirected to untrusted DNS servers, or when DNS over TCP responses are processed by systemd-resolved. Prioritize remediation for internet-facing, server, and workstation fleets where systemd-resolved is active. The issue is old, but memory corruption in DNS resolution can have broad operational impact if vulnerable packages remain deployed. Mitigation focus: Inventory Linux hosts using systemd-resolved through systemd 233.; Apply relevant vendor or distribution security updates for systemd-resolved.; Check vendor advisories for supported backports and package-specific fixed versions..

Prepared: Jun 13, 2026, 04:43 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 28, 2017, 06:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

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Source materials

CVE List V5 sourceCVE List V5
https://launchpad.net/bugs/1695546CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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