Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt Patch, Vendor Advisory
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · nlnetlabs, canonicalNVD modified 2026-10-08 21:17
Affected (CPE criteria) 2
cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
References 14
- https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelog Product, Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt Patch, Vendor Advisory
- https://seclists.org/bugtraq/2019/Oct/23
- https://usn.ubuntu.com/4149-1/ Third Party Advisory
- https://www.debian.org/security/2019/dsa-4544
- https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelog Product, Release Notes
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txt Patch, Vendor Advisory
- https://seclists.org/bugtraq/2019/Oct/23
- https://usn.ubuntu.com/4149-1/ Third Party Advisory
- https://www.debian.org/security/2019/dsa-4544