CVE-2024-21491
5.9 · MEDIUMOverview
CVE-2024-21491 is a medium-severity vulnerability affecting svix svix-webhooks. It was published on February 13, 2024 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Versions of the package svix before 1.17.0 are vulnerable to Authentication Bypass due to an issue in the verify function where signatures of different lengths are incorrectly compared. An attacker can bypass signature verification by providing a shorter signature that matches the beginning of the actual signature. **Note:** The attacker would need to know a victim uses the Rust library for verification,no easy way to automatically check that; and uses webhooks by a service that uses Svix, and then figure out a way to craft a malicious payload that will actually include all of the correct identifiers needed to trick the receivers to cause actual issues.
Remediation
Check the references section for vendor advisories and patches from svix. Update svix-webhooks 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 |
|---|---|---|---|
| svix | svix-webhooks | >= 0, < 1.17.0 | Affected |
References
Frequently Asked Questions
What is CVE-2024-21491?
CVE-2024-21491 is a medium-severity vulnerability affecting svix svix-webhooks. It was published on February 13, 2024 and has a CVSS 3.1 base score of 5.9 (MEDIUM).
How severe is CVE-2024-21491?
This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2024-21491?
Check the references section for vendor advisories and patches from svix. Update svix-webhooks 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-2024-21491?
CyberStrike's AI-powered security agents can automatically detect CVE-2024-21491 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.
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