CVE-2021-33056
7.5 · HIGHOverview
CVE-2021-33056 is a high-severity vulnerability affecting linphone belle-sip. It was published on August 12, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Belledonne Belle-sip before 4.5.20, as used in Linphone and other products, can crash via an invalid From header in a SIP message.
Remediation
Check the references section for vendor advisories and patches from linphone. Update belle-sip to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linphone | belle-sip | >= 0, < 4.5.20 | Affected |
References
Frequently Asked Questions
What is CVE-2021-33056?
CVE-2021-33056 is a high-severity vulnerability affecting linphone belle-sip. It was published on August 12, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-33056?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-33056?
Check the references section for vendor advisories and patches from linphone. Update belle-sip to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-33056?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-33056 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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