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CVE-2021-29505 — AI Deep Analysis Summary

CVSS 7.5 · High

Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: XStream is a lightweight Java library for object-to-XML/JSON serialization. This vulnerability allows **Remote Code Execution (RCE)** via manipulated input streams.…
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Q2Root Cause? (CWE/Flaw)

🛡️ **Root Cause**: **CWE-94** (Code Injection). The flaw lies in how XStream handles deserialization.…
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Q3Who is affected? (Versions/Components)

📦 **Affected**: **XStream versions before 1.4.17**. 🏢 **Vendor**: x-stream. 📱 **Product**: xstream. Any Java application using this library version is at risk. 🕰️ **Published**: May 28, 2021.

Q4What can hackers do? (Privileges/Data)

💣 **Attacker Capabilities**: Full **RCE** (Remote Code Execution). 👤 **Privileges**: Requires 'Low' privileges (PR:L) but no user interaction (UI:N).…
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Q5Is exploitation threshold high? (Auth/Config)

🔓 **Exploitation Threshold**: **High Complexity (AC:H)** but **No Auth Required (UI:N)**. 🌐 **Network**: Attackable remotely (AV:N).…
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Q6Is there a public Exp? (PoC/Wild Exploitation)

🔥 **Public Exploits**: **YES**. Multiple PoCs exist. 🛠️ **Tools**: YsoSerial (CommonsCollections6 chain) is used for testing.…
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Q7How to self-check? (Features/Scanning)

🔍 **Self-Check**: 1. Scan for XStream library versions < 1.4.17. 2. Use Nuclei templates (`CVE-2021-29505.yaml`) for automated detection. 3.…
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Q8Is it fixed officially? (Patch/Mitigation)

✅ **Official Fix**: **YES**. Upgrade to **XStream 1.4.17** or later. 📢 **Advisories**: Confirmed by NetApp, Oracle, Debian (DSA-5004), and Fedora. Patches are available and recommended immediately.…
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Q9What if no patch? (Workaround)

🚧 **No Patch Workaround**: 1. **Input Validation**: Strictly sanitize XML/JSON inputs. 2. **Disable Deserialization**: If possible, disable XStream's dynamic instantiation features. 3.…
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Q10Is it urgent? (Priority Suggestion)

🚨 **Urgency**: **HIGH**. ⚡ **Priority**: Critical. RCE vulnerabilities with public PoCs are top-tier threats. 📉 **Risk**: CVSS Vector indicates high severity.…
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Vulnerability detail Full AI analysis (login) x-stream CWE-94