TI-2025-16839 Aliases CVE-2025-23028 GHSA-9m5p-c77c-f9j7

DoS in Cilium agent DNS proxy from crafted DNS responses

LOW 30CWE-770Published 2025-01-22 · Updated 2025-02-18

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. A denial of service vulnerability affects versions 1.14.0 through 1.14.7, 1.15.0 through 1.15.11, and 1.16.0 through 1.16.4. In a Kubernetes cluster where Cilium is configured to proxy DNS traffic, an attacker can crash Cilium agents by sending a crafted DNS response to workloads from outside the cluster. For traffic that is allowed but without using DNS-based policy, the dataplane will continue to pass traffic as configured at the time of the DoS. For workloads that have DNS-based policy configured, existing connections may continue to operate, and new connections made without relying on DNS resolution may continue to be established, but new connections which rely on DNS resolution may be disrupted. Any configuration changes that affect the impacted agent may not be applied until the agent is able to restart. This issue is fixed in Cilium v1.14.18, v1.15.12, and v1.16.5. No known workarounds are available.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00453 39th percentileScored 2026-11-07

Fix Fixed cilium (cilium): 1.14.18, 1.15.12, 1.16.5github.com/cilium/cilium (Go): 1.14.18, 1.15.12, 1.16.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
cilium	cilium	1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5	1.14.18, 1.15.12, 1.16.5	Patch available	CNA
—	github.com/cilium/cilium (Go)	1.14.0 to before 1.14.18	1.14.18	Patch available	GHSA-9m5p-c77c-f9j7
—	github.com/cilium/cilium (Go)	1.15.0 to before 1.15.12	1.15.12	Patch available	GHSA-9m5p-c77c-f9j7
—	github.com/cilium/cilium (Go)	1.16.0 to before 1.16.5	1.16.5	Patch available	GHSA-9m5p-c77c-f9j7

cilium Vendorcilium Affected 1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5 Fixed in 1.14.18, 1.15.12, 1.16.5 Patch available CNA
github.com/cilium/cilium (Go) Vendor— Affected 1.14.0 to before 1.14.18 Fixed in 1.14.18 Patch available GHSA-9m5p-c77c-f9j7
github.com/cilium/cilium (Go) Vendor— Affected 1.15.0 to before 1.15.12 Fixed in 1.15.12 Patch available GHSA-9m5p-c77c-f9j7
github.com/cilium/cilium (Go) Vendor— Affected 1.16.0 to before 1.16.5 Fixed in 1.16.5 Patch available GHSA-9m5p-c77c-f9j7

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cilium:cilium::::::::	1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5	Vulnerable	cilium

cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:* Versions 1.14.0 to before 1.14.18; 1.15.0 to before 1.15.12; 1.16.0 to before 1.16.5 Vulnerable ·cilium

Remediation

Fix · CNA cilium (cilium) Fixed in 1.14.18, 1.15.12, 1.16.5
Fix · GHSA-9m5p-c77c-f9j7 github.com/cilium/cilium (Go) Fixed in 1.14.18 Advisory →
Fix · GHSA-9m5p-c77c-f9j7 github.com/cilium/cilium (Go) Fixed in 1.15.12 Advisory →
Fix · GHSA-9m5p-c77c-f9j7 github.com/cilium/cilium (Go) Fixed in 1.16.5 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-23028
2026-10-03 Alias added: GHSA-9m5p-c77c-f9j7

References

Patch 1

https://github.com/cilium/cilium/pull/36252

Advisory 2

Other 3

TI-2024-32092 CIDR deny policies may not take effect when a more narrow CIDR allow is present CVSS 3.1HIGH 8.7
TI-2023-12305 Cilium eBPF filters may be temporarily removed during agent restart CVSS 3.1CRITICAL 9.8
TI-2023-20486 Cilium NetworkPolicy bypass via pod labels CVSS 3.1CRITICAL 9.0
TI-2022-11721 Incorrect Default Permissions in Cilium CVSS 3.1HIGH 8.8
TI-2026-36600 Cilium: Sensitive information disclosure and cluster disruption via local Envoy admin socket access CVSS 3.1CRITICAL 9.2
TI-2026-40915 Cilium: Namespaced HTTPRoutes can redirect traffic to other namespaces CVSS 3.1HIGH 8.9

See all 34 →

Sources

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