CVE-2023-25690 — AI Deep Analysis Summary

Q: Who is affected? (Versions/Components)

📦 **Affected**: **Apache HTTP Server** versions **2.4.0 through 2.4.55**. 🏢 **Vendor**: Apache Software Foundation. ⚠️ Specifically impacts servers using `mod_proxy` with certain URL rewriting rules.

Q: Is there a public Exp? (PoC/Wild Exploitation)

💥 **Exploitation**: **Yes, Public PoCs exist**. Multiple GitHub repos (e.g., `dhmosfunk/CVE-2023-25690-POC`) demonstrate HTTP Request Smuggling. CVSS Score: **9.8 (Critical)**. 🚀

Q: Is it fixed officially? (Patch/Mitigation)

✅ **Fix**: **Yes, Officially Patched**. Apache released fixes in versions >2.4.55. 🛠️ Debian/Ubuntu users need to upgrade `apache2` package (e.g., to 2.4.38-3+deb10u10). 📥

Q: What if no patch? (Workaround)

🚧 **No Patch?**: 1. **Disable `mod_proxy`** if not needed. 🚫 2. **Restrict `RewriteRule`** to prevent space-in-URL exploitation. 🛑 3. **WAF Rules**: Block HTTP Request Smuggling patterns. 🛡️

Q: Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. CVSS 9.8. High impact on security posture. Immediate patching or mitigation required for any production server using vulnerable versions with proxy configs. ⏳

Updated May 08, 2026

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Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Apache HTTP Server (v2.4.0–2.4.55) has a flaw in `mod_proxy` config allowing **HTTP Request Smuggling**.…

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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-444** (Expected Behavior Violation). The flaw lies in how `mod_proxy` handles specific `RewriteRule` or `ProxyPassMatch` configurations.…

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Q3Who is affected? (Versions/Components)

📦 **Affected**: **Apache HTTP Server** versions **2.4.0 through 2.4.55**. 🏢 **Vendor**: Apache Software Foundation. ⚠️ Specifically impacts servers using `mod_proxy` with certain URL rewriting rules.

Q4What can hackers do? (Privileges/Data)

💻 **Attacker Actions**: 
**Bypass Access Control**: Trick the proxy into allowing unauthorized URLs. 🔓
**Request Smuggling**: Inject malicious requests into backend services. 📦
…

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Q5Is exploitation threshold high? (Auth/Config)

⚖️ **Threshold**: **Medium/High**. Requires specific **vulnerable configuration** (`mod_proxy` + specific `RewriteRule`/`ProxyPassMatch`).…

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Q6Is there a public Exp? (PoC/Wild Exploitation)

💥 **Exploitation**: **Yes, Public PoCs exist**. Multiple GitHub repos (e.g., `dhmosfunk/CVE-2023-25690-POC`) demonstrate HTTP Request Smuggling. CVSS Score: **9.8 (Critical)**. 🚀

Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: 
Check Apache version (`httpd -v`). 📋
Audit `httpd.conf` for `mod_proxy` + `RewriteRule`/`ProxyPassMatch`. 🔎
…

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Q8Is it fixed officially? (Patch/Mitigation)

✅ **Fix**: **Yes, Officially Patched**. Apache released fixes in versions >2.4.55. 🛠️ Debian/Ubuntu users need to upgrade `apache2` package (e.g., to 2.4.38-3+deb10u10). 📥

Q9What if no patch? (Workaround)

🚧 **No Patch?**: 
**Disable `mod_proxy`** if not needed. 🚫
**Restrict `RewriteRule`** to prevent space-in-URL exploitation. 🛑
**WAF Rules**: Block HTTP Request Smuggling patterns. 🛡️

Q10Is it urgent? (Priority Suggestion)

🔥 **Urgency**: **CRITICAL**. CVSS 9.8. High impact on security posture. Immediate patching or mitigation required for any production server using vulnerable versions with proxy configs. ⏳

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Vulnerability detail Full AI analysis (login) Apache Software Foundation CWE-444