PatchTheCVECVE-2017-9430: Stack-based buffer overflow in dnstracer through 1.9 allows attackers to cause a denial of service (applicatio
CVE-2017-9430 is a critical-severity flaw (CVSS 9.8) affecting dnstracer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Stack-based buffer overflow in dnstracer through 1.9 allows attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a command line with a long name argument that is mishandled in a strcpy call for argv[0]. An example threat model is a web application that launches dnstracer with an untrusted name string.
Why this priority
- Critical severity
- EPSS top 4%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 11.4% (top 4%) |
| CISA exploited list | No |
| Weakness | CWE-119 |
| Published | 2017-06-05 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Exploit-DB: DNSTracer 1.8.1 - Buffer Overflow (PoC)
- Exploit-DB: DNSTracer 1.9 - Local Buffer Overflow
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2017-9430?
dnstracer: upgrade to newer than 1.9. Exact commands for each OS are on this page.
Is CVE-2017-9430 being exploited?
CVE-2017-9430 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2017-9430 affect?
CVE-2017-9430 affects dnstracer. Severity is critical (CVSS 9.8). Stack-based buffer overflow in dnstracer through 1.9 allows attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a command line with a long name argument that is mishandled in a strcpy cal
How urgent is CVE-2017-9430?
Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action