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How the CVE Works
CVE-2025-21549 exploits a flaw in Oracle WebLogic Server’s HTTP/2 protocol handling, where malformed HTTP/2 requests cause uncontrolled resource consumption. Attackers send crafted HTTP/2 frames, triggering infinite processing loops or memory leaks, leading to server crashes. The vulnerability resides in the Core component, allowing unauthenticated remote attackers to disrupt service availability via network access. Oracle WebLogic fails to properly validate HTTP/2 stream dependencies, resulting in thread exhaustion and denial-of-service (DoS).
DailyCVE Form
Platform: Oracle WebLogic
Version: 14.1.1.0.0
Vulnerability: HTTP/2 DoS
Severity: High
Date: 06/23/2025
Prediction: Patch by Q3 2025
What Undercode Say
Check HTTP/2 support curl -I --http2-prior-knowledge http://target:port Crash PoC (simplified) while true; do nghttp -vn --no-dep "http://target:port/malformed_frame"; done
How Exploit
1. Craft malicious HTTP/2 frames.
2. Flood target WebLogic Server.
3. Trigger thread deadlock.
Protection from this CVE
- Disable HTTP/2.
- Apply Oracle patches.
- Use WAF filtering.
Impact
- Service disruption.
- No data compromise.
- High uptime risk.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
