NULL pointer dereference in PowerDNS Recursor - CVE-2017-15120

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Main Vulnerability Database Vulnerabilities #VU111731

NULL pointer dereference in PowerDNS Recursor - CVE-2017-15120

Published: June 21, 2025


Vulnerability identifier: #VU111731
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-15120
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error when parsing a specially crafted answer containing a CNAME of a different class than IN. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.


Affected software

PowerDNS Recursor
Fedora
pdns-recursor

How to mitigate CVE-2017-15120

Install update from vendor's website.

PowerDNS Recursor - update to 4.0.8
pdns-recursor - addressed in versions 4.1.3-2.el7, 4.1.3-2.fc27

External References

Related Security Bulletins