CVE-2017-9445

Name: CVE-2017-9445
Creator: NVD / NIST
Published: 2017-06-28T06:29:00.19+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 55.12%

Last modified Jun 17, 2026

CVE-2017-9445 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 55.12% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

55.12%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Systemd Project	Systemd	>= 223, <= 233

References

http://openwall.com/lists/oss-security/2017/06/27/8Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/99302Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038806Third Party Advisory, VDB Entry
https://launchpad.net/bugs/1695546Broken Link
http://openwall.com/lists/oss-security/2017/06/27/8Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/99302Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038806Third Party Advisory, VDB Entry
https://launchpad.net/bugs/1695546Broken Link

Timeline

Published: Jun 28, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-9445?

How severe is CVE-2017-9445?

CVE-2017-9445 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 55.12% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9445?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-9445?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST