CVE-2025-64715

Egress policy bypass via omitted empty CIDRSet

Published Nov 29, 2025 · Updated Dec 1, 2025

Improper access control in affected Cilium releases allows attackers to send traffic to destinations that an egress policy intended to block. The EgressRule.CreateDerivative path resolves AWS security groups to an empty CIDR slice, and the old JSON omission behavior drops toCIDRSet entirely instead of preserving an empty deny set. The affected ranges are before 1.16.17, 1.17.0 through 1.17.9, and 1.18.0 through 1.18.3; reachability requires a policy that names a nonexistent or unattached AWS security group.

CVSS severity4.0
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in affected Cilium releases allows attackers to send traffic to destinations that an egress policy intended to block. The EgressRule.CreateDerivative path resolves AWS security groups to an empty CIDR slice, and the old JSON omission behavior drops toCIDRSet entirely instead of preserving an empty deny set. The affected ranges are before 1.16.17, 1.17.0 through 1.17.9, and 1.18.0 through 1.18.3; reachability requires a policy that names a nonexistent or unattached AWS security group.

The record

CVE
CVE-2025-64715
Published
Nov 29, 2025
Updated
Dec 1, 2025
Vendor
Cilium
Product
Cilium
Classifications
CWE-284
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.16.17
  2. Affected versionversion=>= 1.17.0, < 1.17.10
  3. Affected versionversion=>= 1.18.0, < 1.18.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Cilium · Ciliumversion=< 1.16.17; version=>= 1.17.0, < 1.17.10; version=>= 1.18.0, < 1.18.4

Published CVSS scores

4.0GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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