// For flags

CVE-2025-23028

DoS in Cilium agent DNS proxy from crafted DNS responses

Severity Score

5.3
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2025-01-10 CVE Reserved
  • 2025-01-22 CVE Published
  • 2025-01-23 EPSS Updated
  • 2025-02-18 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-770: Allocation of Resources Without Limits or Throttling
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cilium
Search vendor "Cilium"
 Cilium
Search vendor "Cilium" for product "Cilium"
 >= 1.14.0 < 1.14.18
Search vendor "Cilium" for product "Cilium" and version " >= 1.14.0 < 1.14.18"
en
Affected
Cilium
Search vendor "Cilium"
 Cilium
Search vendor "Cilium" for product "Cilium"
 >= 1.15.0 < 1.15.12
Search vendor "Cilium" for product "Cilium" and version " >= 1.15.0 < 1.15.12"
en
Affected
Cilium
Search vendor "Cilium"
 Cilium
Search vendor "Cilium" for product "Cilium"
 >= 1.16.0 < 1.16.5
Search vendor "Cilium" for product "Cilium" and version " >= 1.16.0 < 1.16.5"
en
Affected