Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 21 products from apple, from apple, from canonical and 18 others, organizations running these solutions should prioritize assessment and patching.
First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.
2019-08-13T21:15:12.583
2025-01-14T19:29:55.853
Modified
CVSSv3.1: 6.5 (MEDIUM)
AV:N/AC:L/Au:S/C:N/I:N/A:C
8.0
6.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | apple | swiftnio | ≤ 1.4.0 | Yes |
| Operating System | apple | mac_os_x | ≥ 10.12 | No |
| Operating System | canonical | ubuntu_linux | ≥ 14.04 | No |
| Application | apache | traffic_server | ≤ 6.2.3 | Yes |
| Application | apache | traffic_server | ≤ 7.1.6 | Yes |
| Application | apache | traffic_server | ≤ 8.0.3 | Yes |
| Operating System | canonical | ubuntu_linux | 16.04 | Yes |
| Operating System | canonical | ubuntu_linux | 18.04 | Yes |
| Operating System | canonical | ubuntu_linux | 19.04 | Yes |
| Operating System | debian | debian_linux | 9.0 | Yes |
| Operating System | debian | debian_linux | 10.0 | Yes |
| Operating System | fedoraproject | fedora | 30 | Yes |
| Application | synology | skynas | - | Yes |
| Operating System | synology | diskstation_manager | 6.2 | Yes |
| Operating System | synology | vs960hd_firmware | - | Yes |
| Hardware | synology | vs960hd | - | No |
| Operating System | debian | debian_linux | 9.0 | Yes |
| Operating System | debian | debian_linux | 10.0 | Yes |
| Operating System | fedoraproject | fedora | 29 | Yes |
| Operating System | fedoraproject | fedora | 30 | Yes |
| Operating System | fedoraproject | fedora | 32 | Yes |
| Operating System | opensuse | leap | 15.0 | Yes |
| Operating System | opensuse | leap | 15.1 | Yes |
| Application | redhat | jboss_core_services | 1.0 | Yes |
| Application | redhat | jboss_enterprise_application_platform | 7.2.0 | Yes |
| Application | redhat | jboss_enterprise_application_platform | 7.3.0 | Yes |
| Application | redhat | openshift_service_mesh | 1.0 | Yes |
| Application | redhat | quay | 3.0.0 | Yes |
| Application | redhat | software_collections | 1.0 | Yes |
| Operating System | redhat | enterprise_linux | 8.0 | Yes |
| Application | oracle | graalvm | 19.2.0 | Yes |
| Application | mcafee | web_gateway | < 7.7.2.24 | Yes |
| Application | mcafee | web_gateway | < 7.8.2.13 | Yes |
| Application | mcafee | web_gateway | < 8.2.0 | Yes |
| Application | f5 | nginx | < 1.16.1 | Yes |
| Application | f5 | nginx | ≤ 1.17.2 | Yes |
| Application | nodejs | node.js | < 8.16.1 | Yes |
| Application | nodejs | node.js | < 10.16.3 | Yes |
| Application | nodejs | node.js | < 12.8.1 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For apple's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.