CVE-2021-21240
7.5 · HIGHOverview
CVE-2021-21240 is a high-severity vulnerability affecting httplib2_project httplib2. It was published on February 8, 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
httplib2 is a comprehensive HTTP client library for Python. In httplib2 before version 0.19.0, a malicious server which responds with long series of "\xa0" characters in the "www-authenticate" header may cause Denial of Service (CPU burn while parsing header) of the httplib2 client accessing said server. This is fixed in version 0.19.0 which contains a new implementation of auth headers parsing using the pyparsing library.
Remediation
Check the references section for vendor advisories and patches from httplib2_project. Update httplib2 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 |
|---|---|---|---|
| httplib2_project | httplib2 | >= 0, < 0.19.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-21240?
CVE-2021-21240 is a high-severity vulnerability affecting httplib2_project httplib2. It was published on February 8, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-21240?
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-2021-21240?
Check the references section for vendor advisories and patches from httplib2_project. Update httplib2 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-2021-21240?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-21240 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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