---
id: CVE-2024-47825
aliases:
  - GHSA-3wwx-63fv-pfq6
  - BIT-cilium-2024-47825
  - BIT-cilium-operator-2024-47825
  - BIT-hubble-relay-2024-47825
  - GO-2024-3208
title: >-
  Cilium's CIDR deny policies may not take effect when a more narrow CIDR allow
  is present
summary: >-
  Cilium's CIDR deny policies may not take effect when a more narrow CIDR allow
  is present
severity: medium
cvss: 4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N'
vendor: cilium
product: github.com/cilium/cilium
ecosystem: go
affected:
  - 'github.com/cilium/cilium >= 1.15.0, < 1.15.10'
  - 'github.com/cilium/cilium >= 1.14.0, < 1.14.16'
patched:
  - github.com/cilium/cilium 1.15.10
  - github.com/cilium/cilium 1.14.16
published: '2024-10-21'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:50:19.136694045Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-3wwx-63fv-pfq6'
references:
  - url: 'https://github.com/cilium/cilium/security/advisories/GHSA-3wwx-63fv-pfq6'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-47825'
  - url: >-
      https://github.com/cilium/cilium/commit/02d28d9ac9afcaddd301fae6fb4d6cda8c2d0c45
  - url: >-
      https://github.com/cilium/cilium/commit/9c01afb5646af3f0c696421a410dc66c513b6524
  - url: 'https://github.com/cilium/cilium'
tags:
  - osv
  - go
epss: 0.00397
epssPercentile: 0.31046
ingestedAt: '2026-09-12T03:13:01.750Z'
---

## Overview

### Impact

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
```

### Patches

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

### 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](https://docs.cilium.io/en/latest/community/community/#slack).

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


## Affected packages

- `github.com/cilium/cilium >= 1.15.0, < 1.15.10`
- `github.com/cilium/cilium >= 1.14.0, < 1.14.16`

## Remediation

Upgrade to a patched release:

- `github.com/cilium/cilium 1.15.10`
- `github.com/cilium/cilium 1.14.16`