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Fencer Vulns
medium 4.0

CVE-2024-47825 json

CIDR deny policies may not take effect when a more narrow CIDR allow is present

published 2024-10-21 2 y ago modified 2026-09-10 1 mo ago also BIT-cilium-2024-47825 , BIT-cilium-operator-2024-47825 , BIT-hubble-relay-2024-47825 , EUVD-2024-2923 , GHSA-3wwx-63fv-pfq6 , GO-2024-3208

cvss
4.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Starting in version 1.14.0 and prior to versions 1.14.16 and 1.15.10, 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`.This issue has been patched in Cilium v1.14.16 and v1.15.10. As this issue only affects policies using `enableDefaultDeny: false` or that set `toEntities` to `all`, some workarounds are available. For users with policies using `enableDefaultDeny: false`, remove this configuration option and explicitly define any allow rules required. For users with egress policies that explicitly specify `toEntities: all`, use `toEntities: world`.

Patch / fix

  • go github.com/cilium/cilium 1.14.16, 1.15.10
  • bitnami cilium 1.16.0
  • bitnami cilium-operator 1.16.0
  • bitnami hubble-relay 1.16.0
  • cilium cilium 1.14.16, 1.15.10
  • govulncheck-vulndb SLE Module for Package Hub 15 SP6, SLE Module for Package Hub 15 SP5, openSUSE Leap 15.6 +1 more 0.0.20241030T212825-150000.1.9.1

suse advisories SUSE-SU-2024:3911-1

  • govulncheck-vulndb Package Hub 12 0.0.20241104T154416-5.1
  • govulncheck-vulndb openSUSE Tumbleweed 0.0.20241030T212825-1.1

opensuse advisories openSUSE-SU-2024:0350-1openSUSE-SU-2024:14447-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
GitHub 3.1 4.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
OSV 3.1 8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/cilium/cilium
>=1.15.0, <1.15.10
>=1.14.0, <1.14.16
1.15.10
1.14.16
bitnami cilium
>=1.15.4, <1.16.0
1.16.0
bitnami cilium-operator
>=1.15.4, <1.16.0
1.16.0
bitnami hubble-relay
>=1.14.0, <1.16.0
1.16.0

Affected products

  • cilium cilium

Classification

Weakness
  • CWE-276 Incorrect Default Permissions
  • CWE-1038 Insecure Automated Optimizations

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.