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Fencer Vulns
low 3.5

CVE-2023-41332 json

Denial of service via Kubernetes annotations in specific Cilium configurations

published 2023-09-26 3 y ago modified 2026-09-10 1 mo ago also BIT-cilium-2023-41332 , BIT-cilium-operator-2023-41332 , BIT-cilium-proxy-2023-41332 , BIT-hubble-2023-41332 , BIT-hubble-relay-2023-41332 , BIT-hubble-ui-2023-41332 , BIT-hubble-ui-backend-2023-41332 , EUVD-2023-2388 , GHSA-24m5-r6hv-ccgp , GO-2023-2079

cvss
3.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. In Cilium clusters where Cilium's Layer 7 proxy has been disabled, creating workloads with `policy.cilium.io/proxy-visibility` annotations (in Cilium >= v1.13) or `io.cilium.proxy-visibility` annotations (in Cilium <= v1.12) causes the Cilium agent to segfault on the node to which the workload is assigned. Existing traffic on the affected node will continue to flow, but the Cilium agent on the node will not able to process changes to workloads running on the node. This will also prevent workloads from being able to start on the affected node. The denial of service will be limited to the node on which the workload is scheduled, however an attacker may be able to schedule workloads on the node of their choosing, which could lead to targeted attacks. This issue has been resolved in Cilium versions 1.14.2, 1.13.7, and 1.12.14. Users unable to upgrade can avoid this denial of service attack by enabling the Layer 7 proxy.

Patch / fix

  • go github.com/cilium/cilium 1.12.14, 1.13.7, 1.14.2
  • bitnami cilium 1.12.14, 1.13.7, 1.14.2
  • bitnami cilium-operator 1.12.14, 1.13.7, 1.14.2
  • bitnami cilium-proxy 1.12.14, 1.13.7, 1.14.2
  • bitnami hubble 1.12.14, 1.13.7, 1.14.2
  • bitnami hubble-relay 1.12.14, 1.13.7, 1.14.2
  • bitnami hubble-ui 1.12.14, 1.13.7, 1.14.2
  • bitnami hubble-ui-backend 1.12.14, 1.13.7, 1.14.2
  • cilium cilium 1.12.14, 1.13.7, 1.14.2

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/cilium/cilium/pull/27597 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/cilium/cilium/security/advisories/GHSA-24m5-r6hv-ccgp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
OSV 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/cilium/cilium
>=1.14.0, <1.14.2
<1.12.14
>=1.13.0, <1.13.7
1.14.2
1.12.14
1.13.7
bitnami cilium
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami cilium-operator
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami cilium-proxy
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami hubble
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami hubble-relay
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami hubble-ui
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2
bitnami hubble-ui-backend
<1.12.14
>=1.13.0, <1.13.7
>=1.14.0, <1.14.2
1.12.14
1.13.7
1.14.2

Affected products

  • cilium cilium

Classification

Weakness
  • CWE-755 Improper Handling of Exceptional Conditions

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.