CVE-2019-16866
HIGHCVSS 7.5/10EPSS 3.51%
Last modified
CVE-2019-16866 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.51% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nlnetlabs | Unbound | < 1.9.4 |
| Canonical | Ubuntu Linux | 19.04 |
References
- https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/ChangelogProduct, Release Notes
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txtPatch, Vendor Advisory
- https://usn.ubuntu.com/4149-1/Third Party Advisory
- https://github.com/NLnetLabs/unbound/blob/release-1.9.4/doc/ChangelogProduct, Release Notes
- https://nlnetlabs.nl/downloads/unbound/CVE-2019-16866.txtPatch, Vendor Advisory
- https://usn.ubuntu.com/4149-1/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-16866?
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.
How severe is CVE-2019-16866?
CVE-2019-16866 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.51% probability of exploitation in the next 30 days.
How do I fix CVE-2019-16866?
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-16866?
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Scan your code nowSource: NVD / NIST