# CVE-2023-30464: CoreDNS DNS cache poisoning via birthday attack

Source: https://junglewise.ai/threats/cve-2023-30464-coredns-dns-cache-poisoning-via-birthday-attack  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-09-18. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2023-30464 · Severity: low · CVSS 3.7 · Published 2024-09-18

CoreDNS, a widely used DNS server often found in Kubernetes environments, is vulnerable to DNS cache poisoning. An attacker can exploit this to redirect network traffic to malicious servers by injecting fraudulent DNS records into the system's memory. This could lead to users being directed to phishing sites or the interception of sensitive corporate data.

Technologies: [CoreDNS](https://junglewise.ai/threats/technologies/coredns), [github.com/coredns/coredns (Go)](https://junglewise.ai/threats/technologies/github-com-coredns-coredns). Vendors: [CoreDNS](https://junglewise.ai/threats/vendors/coredns), [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2023-30464 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2023-30464 being exploited in the wild.

**How severe is CVE-2023-30464?** Low severity, with a CVSS score of 3.7, published 18 September 2024.

**Which products and versions are affected?** CoreDNS <= 1.10.1; github.com/coredns/coredns (Go) <= 1.10.1, SEMVER:introduced=0,fixed=1.11.0, SEMVER:introduced=0,last_affected=1.10.1.

**Is there a fix for CVE-2023-30464?** Yes. github.com/coredns/coredns (Go): upgrade to 1.11.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-30464 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2023-30464?** Check whether you run CoreDNS or github.com/coredns/coredns (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/coredns/coredns (Go): upgrade to 1.11.0 or later

  ```sh
  go get github.com/coredns/coredns@v1.11.0
  ```


## Technical details

CoreDNS through version 1.10.1 is susceptible to DNS cache poisoning via a birthday attack (CWE-290). The vulnerability allows a remote, unauthenticated attacker to inject forged DNS records into the cache by sending a high volume of malicious responses that match the transaction ID and port of a legitimate pending query. Successful exploitation requires the attacker to overcome high complexity due to the probabilistic nature of the birthday attack. A fix has been identified in the project's source code repository, though specific patched release versions should be verified against the latest project updates.

## Affected products

- CoreDNS CoreDNS <= 1.10.1

## Identifiers

- CVE-2023-30464
- GHSA-h92q-fgpp-qhrq
- GO-2024-3134

## Timeline

- 2024-09-18: advisory: GitHub Advisory published
- 2024-09-18: disclosed: NVD publication date

## References

- [https://api.github.com/users/cookesan](https://api.github.com/users/cookesan)
- [https://github.com/cookesan](https://github.com/cookesan)
- [https://api.github.com/users/cookesan/gists%7B/gist_id%7D](https://api.github.com/users/cookesan/gists%7B/gist_id%7D)
- [https://api.github.com/users/cookesan/repos](https://api.github.com/users/cookesan/repos)
- [https://avatars.githubusercontent.com/u/6601329?v=4](https://avatars.githubusercontent.com/u/6601329?v=4)
- [https://api.github.com/users/cookesan/events%7B/privacy%7D](https://api.github.com/users/cookesan/events%7B/privacy%7D)

## Related threats

- [CoreDNS RFC 2136 UPDATE bypass in DoH/DoQ/gRPC](https://junglewise.ai/threats/cve-2026-86003-coredns-rfc-2136-update-bypass-in-doh-doq-grpc)
- [CoreDNS unauthenticated memory exhaustion in DoH, DoQ, and DoH3](https://junglewise.ai/threats/cve-2026-82399-coredns-unauthenticated-memory-exhaustion-in-doh-doq-and-doh3)
- [CoreDNS panic in transfer plugin via k8s_external headless services](https://junglewise.ai/threats/cve-2026-62994-coredns-panic-in-transfer-plugin-via-k8s-external-headless)
- [CoreDNS NULL pointer dereference in proxyproto plugin](https://junglewise.ai/threats/cve-2026-62309-coredns-null-pointer-dereference-in-proxyproto-plugin)
- [CoreDNS NULL pointer dereference in rewrite plugin](https://junglewise.ai/threats/cve-2026-62299-coredns-null-pointer-dereference-in-rewrite-plugin)