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HIGH severity

CVE-2017-15133 — dns

HIGHFix: miekg/dns#631

CVE-2017-15133 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in github.com/miekg/dns. A fix is available for github.com/miekg/dns — see the affected versions and patch details below.

Denial of Service in miekg-dns

Also known asGHSA-p55x-7x9v-q8m4GO-2020-0006
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.17%0.91%1.65%2.39%0.7%1.9%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2017-15133 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/miekg/dns

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

A denial of service flaw was found in miekg-dns before 1.0.4. A remote attacker could use carefully timed TCP packets to block the DNS server from accepting new connections.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/miekg/dnsall versions1.0.4go get github.com/miekg/dns@v1.0.4

Affected Products

1 product · 1 configurations
Application
miekg-dnsmiekg-dns_prject
< 1.0.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/miekg/dns, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/miekg/dns to 1.0.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2017-15133 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

A denial of service flaw was found in miekg-dns before 1.0.4. A remote attacker could use carefully timed TCP packets to block the DNS server from accepting new connections.
O3 Security · Impact-Aware SCA

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CVE-2017-15133: dns DoS — Fixed in 1.0.4