CVE Enrichment

CVSS
7.5 HIGH
EPSS
100.00%
EPSS Percentile
100.00%
CISA KEV
YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version
3.1
CNA / NVD Source
[email protected]
Published
10-Oct-2023 21:15
Last Modified
12-Aug-2026 02:37
EPSS Date
2026-10-23
CWE
CWE-400

CVSS Vector

CVSS:3.1 AV:N / AC:L / PR:N / UI:N / S:U / C:N / I:N / A:H

CISA KEV Details

Date Added
2023-10-10
Remediation Due
2023-10-31
Known Ransomware Campaign Use
Unknown
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.
Notes
This vulnerability affects a common open-source component, third-party library, or protocol used by different products. For more information, please see: HTTP/2 Rapid Reset Vulnerability, CVE-2023-44487 | CISA: https://www.cisa.gov/news-events/alerts/2023/10/10/http2-rapid-reset-vulnerability-cve-2023-44487; https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/; https://nvd.nist.gov/vuln/detail/CVE-2023-44487

Affected Products / Versions

References

Last enrichment sync: 24-Oct-2026 21:19
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

CVE (6)

MITRE ATT&CK (1)

Vendors (1)

Products (8)

Tools (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.