CVE-2021-27877 — AI Deep Analysis Summary

🚨 **What is this vulnerability?** * **Essence:** A security flaw in Veritas Backup Exec. * **Mechanism:** It involves an outdated authentication scheme (SHA) that was never disabled.…

🛡️ **Root Cause? (CWE/Flaw)** * **Flaw:** Legacy authentication support. * **Detail:** The software still supports an old 'SHA authentication' scheme.…

📦 **Who is affected? (Versions/Components)** * **Product:** Veritas Backup Exec. * **Affected Versions:** **Before 21.2**. * **Component:** The Backup Exec Agent.…

💀 **What can hackers do? (Privileges/Data)** * **Access:** Gain **unauthorized access** to the Agent. * **Action:** Execute **privileged commands** remotely.…

⚡ **Is exploitation threshold high? (Auth/Config)** * **Threshold:** **LOW**. * **Auth:** No authentication required (PR:N). * **Complexity:** Low complexity (AC:L).…

🔍 **Is there a public Exp? (PoC/Wild Exploitation)** * **PoC:** Yes. * **Source:** Nuclei templates available on GitHub (projectdiscovery). * **Reference:** PacketStorm Security has detailed reports.…

🔎 **How to self-check? (Features/Scanning)** * **Tool:** Use **Nuclei** with the specific CVE template. * **Link:** Check the GitHub repo for the YAML template.…

🔧 **Is it fixed officially? (Patch/Mitigation)** * **Fix:** Yes. * **Solution:** Upgrade to **Version 21.2 or later**. * **Action:** The vendor disabled the legacy SHA authentication in newer releases.…

🚧 **What if no patch? (Workaround)** * **Immediate Action:** Disable the legacy SHA authentication scheme manually if possible. * **Network:** Restrict network access to the Backup Exec Agent.…

🔥 **Is it urgent? (Priority Suggestion)** * **Priority:** **HIGH**. * **Reason:** Remote, unauthenticated, low complexity. * **Risk:** CVSS Score indicates Critical Confidentiality impact.…