Cyber Resilience

CVE-2026-20916

HighUpdated

Published: 13 May 2026

Published
13 May 2026
Modified
29 June 2026
KEV Added
—
Patch
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CVSS Score v4 7.2 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0037 28.5th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-20916 is a high-severity Path Traversal (CWE-22) vulnerability in F5 Big-Iq Centralized Management. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Ingress Tool Transfer (T1105); ranked at the 28.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability details

An authenticated iControl REST user with low privileges can create or modify arbitrary files through an undisclosed iControl REST endpoint on the BIG-IQ system.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE(s)
CWE-22

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1105 Ingress Tool Transfer Command And Control
Adversaries may transfer tools or other files from an external system into a compromised environment.
attack.mitre.org →
T1505.003 Web Shell Persistence
Adversaries may backdoor web servers with web shells to establish persistent access to systems.
attack.mitre.org →
Why these techniques?

Arbitrary file creation/modification via authenticated API endpoint directly enables uploading tools (T1105) and dropping web shells (T1505.003).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-24970Shared CWE-22
CVE-2025-24406Shared CWE-22
CVE-2020-36939Shared CWE-22
CVE-2026-27523Shared CWE-22
CVE-2026-24848Shared CWE-22
CVE-2026-44243Shared CWE-22
CVE-2025-2505Shared CWE-22
CVE-2026-4350Shared CWE-22
CVE-2026-5841Shared CWE-22
CVE-2026-33242Shared CWE-22

Affected Assets

f5
big-iq centralized management
8.4.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-10 Information Input Validation
addresses: CWE-22

Validates pathnames and filenames to prevent traversal outside intended directories.

References