CVE-2019-25036
HIGHCVSS 7.5/10EPSS 1.99%
Last modified
CVE-2019-25036 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname. NOTE: The vendor disputes that this is a vulnerability. EPSS estimates a 1.99% chance of exploitation in the next 30 days.
Description
Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited
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 | < 1.9.5 |
| Debian | Debian Linux | 9.0 |
References
- https://lists.debian.org/debian-lts-announce/2021/05/msg00007.htmlMailing List, Third Party Advisory
- https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210507-0007/Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00007.htmlMailing List, Third Party Advisory
- https://ostif.org/our-audit-of-unbound-dns-by-x41-d-sec-full-results/Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210507-0007/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-25036?
Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname. NOTE: The vendor disputes that this is a vulnerability. Although the code may be vulnerable, a running Unbound installation cannot be remotely or locally exploited
How severe is CVE-2019-25036?
CVE-2019-25036 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.99% probability of exploitation in the next 30 days.
How do I fix CVE-2019-25036?
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-2019-25036?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST