5.5

CVE-2025-64715: Cilium with misconfigured toGroups in policies can lead to unrestricted egress traffic

Analyzed
AliasesCGA-645h-gcgq-22j8CGA-9937-68q6-f2ghCGA-cq4c-8fjr-xv5r
Published 29-11-2025Last modified 01-12-2025

Vulnerability summary

CVE-2025-64715 is a medium (CVSS 5.5) Improper Access Control vulnerability in cilium. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 5
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0037-1CGA-2PJ7-8HQ9-37RRCGA-J756-4CF4-WX7WCGA-XVWF-F4X8-WPJ8

Timeline

  1. 29-11-2025
    PublishedVulnerability first disclosed.
  2. 01-12-2025
    Last modifiedVulnerability information updated.

Description

Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.16.17, 1.17.10, and 1.18.4, CiliumNetworkPolicys which use egress.toGroups.aws.securityGroupsIds to reference AWS security group IDs that do not exist or are not attached to any network interface may unintentionally allow broader outbound access than intended by the policy authors. In such cases, the toCIDRset section of the derived policy is not generated, which means outbound traffic may be permitted to more destinations than originally intended. This issue has been patched in versions 1.16.17, 1.17.10, and 1.18.4. There are no workarounds for this issue.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard15 products
  • cilium-1.15All versions (No fix recorded)
  • cilium-1.15-clustermesh-apiserverAll versions (No fix recorded)
  • cilium-1.15-hubble-relayAll versions (No fix recorded)
  • cilium-1.15-operator-awsAll versions (No fix recorded)
  • cilium-1.15-operator-genericAll versions (No fix recorded)
Wolfi2 products
  • hubble-ui< 0.13.3-r3
  • hubble-ui-backend< 0.13.3-r3
Cilium1 product
  • cilium< 1.16.17 | ≥ 1.17.0, < 1.17.10 | ≥ 1.18.0, < 1.18.4
Github.com/cilium1 product
  • cilium≥ 1.17.0, < 1.17.10 | < 1.16.17 | ≥ 1.18.0, < 1.18.4

4 vendors · 19 products

References

8 links