What’s Vulnerable › Vulnerabilities

CVE-2017-15120

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 51.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-27 · updated 2026-06-17
• Weakness: CWE-476

Description

An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL pointer dereference when parsing a specially crafted answer containing a CNAME of a different class than IN. An unauthenticated remote attacker could cause a denial of service.

Affected products

• Debian Linux: 8.0, 9.0
• PowerDNS Recursor: before 4.0.8 — fixed in 4.0.8

How to fix

Upgrade to a fixed version: PowerDNS Recursor 4.0.8. Check the vendor advisory for mitigations.

References

• http://seclists.org/oss-sec/2017/q4/382
• http://www.securityfocus.com/bid/106335
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15120
• https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2017-08.html
• https://www.debian.org/security/2017/dsa-4063
• http://seclists.org/oss-sec/2017/q4/382
• http://www.securityfocus.com/bid/106335
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15120
• https://doc.powerdns.com/recursor/security-advisories/powerdns-advisory-2017-08.html
• https://www.debian.org/security/2017/dsa-4063

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