CVE-2023-44487
Published 2023-10-10 · Updated 2026-08-11 · Source cve@mitre.org
Summary
CVE-2023-44487 is a high-severity (CVSS 7.5) vulnerability in IETF HTTP/2. CISA added it to the Known Exploited Vulnerabilities catalog on October 10, 2023, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by October 31, 2023. CISA does not currently list it as used in ransomware campaigns. IETF has 2 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.
All 2 known-exploited IETF vulnerabilities →Description
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA Known-Exploited Vulnerability
Product: IETF — HTTP/2
Name: HTTP/2 Rapid Reset Attack Vulnerability
Date added: 2023-10-10 · Due: 2023-10-31
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
References
- http://www.openwall.com/lists/oss-security/2023/10/10/6
- http://www.openwall.com/lists/oss-security/2023/10/10/7
- http://www.openwall.com/lists/oss-security/2023/10/13/4
- http://www.openwall.com/lists/oss-security/2023/10/13/9
- http://www.openwall.com/lists/oss-security/2023/10/18/4
- http://www.openwall.com/lists/oss-security/2023/10/18/8
- http://www.openwall.com/lists/oss-security/2023/10/19/6
- http://www.openwall.com/lists/oss-security/2023/10/20/8