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High 7.5Published Oct 3, 2019
CVE-2019-16866Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query.
Updated under an hour ago ()
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It affects nlnetlabs unbound and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nlnetlabs unbound nlnetlabs:unbound | before 1.9.4 | NVD |
canonical ubuntu_linux canonical:ubuntu_linux | 19.04 | NVD |
References
- https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/Changelogx-refsource-misc
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txtx-refsource-misc
- https://usn.ubuntu.com/4149-1/vendor-advisory, x-refsource-ubuntu
- https://www.debian.org/security/2019/dsa-4544vendor-advisory, x-refsource-debian
- https://seclists.org/bugtraq/2019/Oct/23mailing-list, x-refsource-bugtraq
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E65NCWZZB2D75ZIYWPXKMVGSGNYW4JMC/vendor-advisory, x-refsource-fedora
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MLRHE7TQFAOV4MB2ELTOGESZYUL65NUJ/vendor-advisory, x-refsource-fedora
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.