Critical F5 BIG-IP Flaw Upgraded to 9.8 RCE, Exploited in the Wild

F5 BIG-IP APM flaw CVE-2025-53521 escalates to critical 9.8 RCE, actively exploited. Patch now, check IoCs, and secure vulnerable systems immediately...

K000160515: F5 System Scanner

Topic This article explains how to install and run the F5 System Scanner on BIG-IP and standard x8664 Linux systems. The F5 System Scanner supports the following BIG-IP versions hotfixes EHFs: BIG-IP versions released between October 2025 and July 15, 2026 EHFs released between October 2025 and...

PT-2026-28800

Name of the Vulnerable Software and Affected Versions Nezha Monitoring versions 2.0.14 through 2.0.19 Description The software allows the 'PATCH /server/id' endpoint to accept and store nonexistent ddns profiles IDs for a server owned by a member. If a different user subsequently creates a DDNS...

Vulnerabilities fixed in F5 Networks BIG-IP, F5OS and NGINX App Protect WAF

F5 Networks has fixed vulnerabilities in the BIG-IP and F5OS product lines and NGINX App Protect WAF. The vulnerabilities include several configuration issues and exploit vectors. A malicious party can exploit the vulnerabilities to launch attacks that can lead to the following categories of...

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2025-53521link is external F5 BIG-IP Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and pos...

VulnCheck KEV: CVE-2025-53521

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution RCE. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

F5 Networks BIG-IP : BIG-IP iRule or LTM policy may generate multiple HTTP redirect responses (K000137322)

The version of F5 Networks BIG-IP installed on the remote host is prior to 15.1.10.3 / 16.1.4.2 / 17.1.1.1. It is, therefore, affected by a vulnerability as referenced in the K000137322 advisory. A specifically crafted HTTP request may lead the BIG-IP system to generate multiple HTTP redirect...

CVE-2026-2507

When BIG-IP AFM or BIG-IP DDoS is provisioned, undisclosed traffic can cause TMM to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2026-2507

When BIG-IP AFM or BIG-IP DDoS is provisioned, undisclosed traffic can cause TMM to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2026-2507 BIG-IP TMM Vulnerability

When BIG-IP AFM or BIG-IP DDoS is provisioned, undisclosed traffic can cause TMM to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

K000160003: BIG-IP TMM vulnerability CVE-2026-2507

Security Advisory Description When BIG-IP AFM or BIG-IP DDoS Hybrid Defender is provisioned, undisclosed traffic can cause the Traffic Management Microkernel TMM to terminate. CVE-2026-2507 Impact Traffic is disrupted while the TMM process restarts. This vulnerability allows a remote,...

F5 Networks BIG-IP : BIG-IP TMM vulnerability (K000160003)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.5.1.5 / Hotfix- BIGIP-17.5.1.4.0.17.20-ENG.iso. It is, therefore, affected by a vulnerability as referenced in the K000160003 advisory. When BIG-IP AFM or BIG-IP DDoS Hybrid Defender is provisioned, undisclosed traffic...

CVE-2026-20732

A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2026-20730

A vulnerability exists in BIG-IP Edge Client and browser VPN clients on Windows that may allow attackers to gain access to sensitive information. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2026-22549

A vulnerability exists in F5 BIG-IP Container Ingress Services that may allow excessive permissions to read cluster secrets. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2026-22548

When a BIG-IP Advanced WAF or ASM security policy is configured on a virtual server, undisclosed requests along with conditions beyond the attacker's control can cause the bd process to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

F5 Networks BIG-IP : BIG-IP SMTP configuration security exposure (K000156643)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.1 / 17.5.1.4 / 21.0.0.1. It is, therefore, affected by a vulnerability as referenced in the K000156643 advisory. An authenticated attacker granted the guest role on a BIG-IP system can modify theSMTP Server Host...

F5 Networks BIG-IP : BIG-IP Edge Client for Windows vulnerability (K000158931)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.1 / None. It is, therefore, affected by a vulnerability as referenced in the K000158931 advisory. A vulnerability exists in BIG-IP Edge Client and browser VPN clients on Windows that may allow attackers to gain acce...

F5 Networks BIG-IP : BIG-IP Advanced WAF and ASM vulnerability (K000158072)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3. It is, therefore, affected by a vulnerability as referenced in the K000158072 advisory. When a BIG-IP Advanced WAF or ASM security policy is configured on a virtual server, undisclosed requests along with condition...

F5 Networks BIG-IP : BIG-IP Configuration utility vulnerability (K000156644)

The version of F5 Networks BIG-IP installed on the remote host is prior to 17.1.3.1 / 17.5.1.4. It is, therefore, affected by a vulnerability as referenced in the K000156644 advisory. A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof...