TI-2022-13100 Aliases CVE-2022-31055

Improper Access Control in kctf

MEDIUM 40CWE-284Published 2022-06-13 · Updated 2025-04-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

kCTF is a Kubernetes-based infrastructure for capture the flag (CTF) competitions. Prior to version 1.6.0, the kctf cluster set-src-ip-ranges was broken and allowed traffic from any IP. The problem has been patched in v1.6.0. As a workaround, those who want to test challenges privately can mark them as `public: false` and use `kctf chal debug port-forward` to connect.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00644 51st percentileScored 2026-11-07

Fix Fixed kctf (google): 1.6.0

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
Google	kctf	before 1.6.0	1.6.0	Patch available	CNA

kctf VendorGoogle Affected before 1.6.0 Fixed in 1.6.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:google:kctf::::::::	before 1.6.0	Vulnerable	Google

cpe:2.3:a:google:kctf:*:*:*:*:*:*:*:* Versions before 1.6.0 Vulnerable ·Google

Remediation

Fix · CNA kctf (google) Fixed in 1.6.0

Timeline

2026-10-02 Threatist record created from CVE-2022-31055
2026-10-25 EPSS moved to the 50th–90th percentile

References

Patch 2

Advisory 1

https://github.com/google/kctf/security/advisories/GHSA-4g2v-6qc6-6jv5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences