SB2025081377 - HTTP/2 Made You Reset Attack in h2o
Published: August 13, 2025 Updated: September 12, 2025
Security Bulletin ID
SB2025081377
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2025-8671)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when handling HTTP/2 requests. A remote attacker can send specially crafted HTTP requests to the affected server and consume its all available memory, leading to denial of service.
Remediation
Install update from vendor's website.