CVE-2025-59269
📋 TL;DR
A stored cross-site scripting (XSS) vulnerability in the BIG-IP Configuration utility allows attackers to inject malicious JavaScript that executes in the context of logged-in users. This affects BIG-IP systems running vulnerable software versions, potentially compromising administrative sessions and system integrity.
💻 Affected Systems
- F5 BIG-IP
📦 What is this software?
Big Ip Advanced Web Application Firewall by F5
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Big Ip Advanced Web Application Firewall by F5
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Big Ip Advanced Web Application Firewall by F5
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Big Ip Advanced Web Application Firewall by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Acceleration Manager by F5
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Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
View all CVEs affecting Big Ip Application Security Manager →
Big Ip Application Security Manager by F5
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Big Ip Application Security Manager by F5
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Big Ip Application Visibility And Reporting by F5
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Big Ip Application Visibility And Reporting by F5
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Big Ip Application Visibility And Reporting by F5
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⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack sessions, modify BIG-IP configurations, redirect traffic, or install persistent backdoors leading to complete system compromise.
Likely Case
Attackers steal session cookies or credentials to gain unauthorized administrative access, potentially modifying load balancer configurations or accessing sensitive network traffic.
If Mitigated
With proper network segmentation and access controls, impact is limited to the BIG-IP management interface with no lateral movement to other systems.
🎯 Exploit Status
Requires attacker to have access to inject malicious content into the vulnerable page, then a victim must visit that page while authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to F5 advisory K000151308 for fixed versions
Vendor Advisory: https://my.f5.com/manage/s/article/K000151308
Restart Required: No
Instructions:
1. Review F5 advisory K000151308 for affected versions. 2. Upgrade to a fixed version listed in the advisory. 3. Apply the patch following F5's standard update procedures. 4. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Configuration Utility Access
allLimit access to the BIG-IP Configuration utility to trusted IP addresses only using network ACLs or firewall rules.
Implement Content Security Policy
allAdd Content Security Policy headers to restrict script execution sources and mitigate XSS impact.
🧯 If You Can't Patch
- Isolate BIG-IP management interface on a separate VLAN with strict access controls
- Implement multi-factor authentication for BIG-IP administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check your BIG-IP version against the affected versions listed in F5 advisory K000151308Check Version:
tmsh show sys versionVerify Fix Applied:
Verify BIG-IP version is updated to a fixed version listed in the F5 advisory📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript payloads in Configuration utility logs
- Multiple failed login attempts followed by successful login from new IP
Network Indicators:
- Unexpected outbound connections from BIG-IP management interface
- Traffic to known malicious domains from BIG-IP
SIEM Query:
source="bigip_logs" AND ("script" OR "javascript" OR "<script>") AND event_type="config_change"