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Vulnerability DatabaseCVE-2021-34801
CVE-2021-34801:
JavaScript vulnerability analysis and mitigation
Overview
Valine 1.4.14 contains a denial of service vulnerability that allows remote attackers to cause an application outage by supplying a user-agent (UA) value that only specifies the product and version. The vulnerability was discovered and disclosed on June 16, 2021 (MITRE, NVD).
Technical details
The vulnerability exists in how Valine 1.4.14 handles incomplete user-agent strings in comments. When a user provides a malformed UA string that only contains the product and version (e.g., 'Mozilla/8.0'), it causes the entire comment system on the affected page to become unresponsive and prevents comments from loading normally (GitHub Issue).
Impact
When successfully exploited, this vulnerability results in a denial of service condition affecting the comment system functionality. Affected pages become unable to load comments properly, effectively disabling the commenting feature for all users (GitHub Issue).
Additional resources
Source: This report was generated using AI
Related JavaScript vulnerabilities:
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