October 10, 2023 · Applied Cybernetics Group
CVE-2023-44487 — IETF HTTP/2
HTTP/2 Rapid Reset Attack Vulnerability
- Added to KEV
2023-10-10- Federal due date
2023-10-31- Vendor
- IETF
- Product
- HTTP/2
- EPSS
- 100.0th percentile (score 0.944, as of
2026-06-08) - NVD CVSS v3.1
- 7.5 (HIGH)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-44487
CISA short description
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
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.
NVD 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.