CVE-2024-47825

Workarounds

Users with policies using enableDefaultDeny: false can work around this issue by removing this configuration option and explicitly defining any allow rules required.

No workaround is available to users with egress policies that explicitly specify toEntities: all.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @squeed, @christarazi, and @jrajahalme for their work in triaging and resolving this issue.

For more information

If you have any questions or comments about this advisory, please reach out on Slack.

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [email protected]. This is a private mailing list for the Cilium security team, and your report will be treated with top priority.

A policy rule denying a prefix that is broader than /32 may be ignored if there is

• A policy rule referencing a more narrow prefix (CIDRSet or toFQDN) and
• This narrower policy rule specifies either enableDefaultDeny: false or - toEntities: all

Note that a rule specifying toEntities: world or toEntities: 0.0.0.0/0 is insufficient, it must be to entity all.

As an example, given the below policies, traffic is allowed to 1.1.1.2, when it should be denied:

apiVersion: cilium.io/v2
kind: CiliumClusterwideNetworkPolicy
metadata:
  name: block-scary-range
spec:
  endpointSelector: {}
  egressDeny:
  - toCIDRSet:
    - cidr: 1.0.0.0/8

---

apiVersion: cilium.io/v2
kind: CiliumNetworkPolicy
metadata:
  name: evade-deny
spec:
  endpointSelector: {}
  egress:
  - toCIDR:
    - 1.1.1.2/32
  - toEntities:
    - all

CVE-2024-47825 has a CVSS score of 4.0 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.15.10, 1.14.16); upgrading removes the vulnerable code path.

Kodem intelligence

This issue affects:

• Cilium v1.14 between v1.14.0 and v1.14.15 inclusive
• Cilium v1.15 between v1.15.0 and v1.15.9 inclusive

This issue has been patched in:

• Cilium v1.14.16
• Cilium v1.15.10

1. What is CVE-2024-47825? CVE-2024-47825 is a medium-severity security vulnerability in github.com/cilium/cilium (go), affecting versions >= 1.15.0, < 1.15.10. It is fixed in 1.15.10, 1.14.16.
2. How severe is CVE-2024-47825? CVE-2024-47825 has a CVSS score of 4.0 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of github.com/cilium/cilium are affected by CVE-2024-47825? github.com/cilium/cilium (go) versions >= 1.15.0, < 1.15.10 is affected.
4. Is there a fix for CVE-2024-47825? Yes. CVE-2024-47825 is fixed in 1.15.10, 1.14.16. Upgrade to this version or later.
5. Is CVE-2024-47825 exploitable, and should I be worried? Whether CVE-2024-47825 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2024-47825 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2024-47825?
   • Upgrade github.com/cilium/cilium to 1.15.10 or later
   • Upgrade github.com/cilium/cilium to 1.14.16 or later