CVE-2026-41957: RCE in F5 BIG-IP Configuration Utility
Platform
linux
Component
bigip
Fixed in
17.5.1.4
CVE-2026-41957 describes a remote code execution (RCE) vulnerability discovered in the F5 BIG-IP and BIG-IQ Configuration utility. This vulnerability allows an authenticated attacker to execute arbitrary code on the affected system. Versions 16.1.0 through 17.5.1.4 are affected, and a patch is available in version 17.5.1.4.
Impact and Attack Scenarios
Successful exploitation of CVE-2026-41957 could allow an attacker to gain complete control over the affected BIG-IP or BIG-IQ system. This includes the ability to modify system configurations, steal sensitive data (such as user credentials, SSL certificates, and network configurations), and potentially pivot to other systems within the network. Given the critical role BIG-IP often plays in network infrastructure, a compromise could have a significant impact on the availability and integrity of services. The undisclosed nature of the vectors makes it difficult to predict the exact attack surface, but the RCE nature of the vulnerability suggests a high potential for severe consequences.
Exploitation Context
CVE-2026-41957 was published on May 13, 2026. The vulnerability's severity is rated HIGH (CVSS 8.8). The undisclosed nature of the attack vectors means that public exploits are currently unavailable, but the RCE nature of the vulnerability suggests a potential for exploitation once the vectors are discovered. Monitor security advisories and threat intelligence feeds for any updates regarding active exploitation campaigns.
Threat Intelligence
Exploit Status
CISA SSVC
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- Low — any valid user account is sufficient. Basic authenticated access required.
- User Interaction
- None — attack is automatic and silent. Victim does nothing: no click, no file open.
- Scope
- Unchanged — impact is limited to the vulnerable component itself.
- Confidentiality
- High — complete confidentiality loss. Attacker can read all data: credentials, keys, personal data.
- Integrity
- High — attacker can write, modify, or delete any data: databases, config files, or code.
- Availability
- High — complete crash or resource exhaustion. Full denial of service.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
Mitigation and Workarounds
The primary mitigation for CVE-2026-41957 is to upgrade to version 17.5.1.4 or later. If immediate upgrading is not possible, consider implementing network segmentation to limit the potential blast radius of a successful attack. While specific WAF rules are not readily available due to the undisclosed vectors, general RCE protection rules may offer some limited protection. Regularly review BIG-IP configurations for any unusual or unauthorized changes. After upgrading, verify the integrity of the system by checking for any unexpected processes or modified files.
How to fix
F5 recomienda aplicar las actualizaciones de seguridad proporcionadas en el aviso de seguridad correspondiente (K000156761). Estas actualizaciones corrigen la vulnerabilidad de ejecución remota de código. Consulte la documentación de F5 para obtener instrucciones detalladas sobre cómo aplicar las actualizaciones.
Frequently asked questions
What is CVE-2026-41957 — RCE in F5 BIG-IP?
CVE-2026-41957 is a remote code execution vulnerability affecting F5 BIG-IP and BIG-IQ Configuration utility versions 16.1.0 through 17.5.1.4. An authenticated attacker can execute arbitrary code.
Am I affected by CVE-2026-41957 in F5 BIG-IP?
You are affected if you are running F5 BIG-IP or BIG-IQ Configuration utility versions 16.1.0 through 17.5.1.4. Check your version immediately.
How do I fix CVE-2026-41957 in F5 BIG-IP?
Upgrade to version 17.5.1.4 or later to remediate the vulnerability. If immediate upgrade is not possible, implement network segmentation.
Is CVE-2026-41957 being actively exploited?
Currently, there are no publicly known exploits, but the RCE nature of the vulnerability suggests a potential for exploitation once the vectors are discovered.
Where can I find the official F5 advisory for CVE-2026-41957?
Refer to the official F5 Security Advisory for CVE-2026-41957 on the F5 website: [https://www.f5.com/security/center/advisory/f5-security-advisory-41957](https://www.f5.com/security/center/advisory/f5-security-advisory-41957)
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