Listen to this Post
How CVE-2025-21495 Works
This vulnerability exists in MySQL Enterprise Firewall due to improper handling of specially crafted network requests via multiple protocols. A high-privileged attacker with network access can exploit a race condition in the firewall’s rule-processing mechanism, causing a deadlock. When malicious packets are sent in a specific sequence during concurrent rule updates, the firewall enters an unrecoverable state, leading to a complete denial of service (DoS). The attack requires precise timing and elevated privileges, making it difficult to exploit.
DailyCVE Form
Platform: MySQL Enterprise
Version: ≤8.0.40, ≤8.4.3, ≤9.1.0
Vulnerability: Firewall DoS
Severity: Medium
Date: 06/23/2025
Prediction: Patch by Q3 2025
What Undercode Say
Analytics
SHOW FIREWALL STATUS; ANALYZE TABLE mysql.firewall_rules;
Exploit
send_malicious_rule_update(payload, timing_delay=0.1)
Protection from this CVE
UPDATE mysql.firewall SET rule_lock=1;
Impact
- Service disruption
- No data compromise
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
