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CVE-2023-44487

HTTP/2 Rapid Reset Attack Vulnerability

  • High 7.5
  • Exploited: added to CISA KEV 10 Oct 2023

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.

Key facts

Published
10 Oct 2023
Last changed
14 Oct 2026
Assigned by
mitre
KEV added
10 Oct 2023
KEV fix due
31 Oct 2023
EPSS
99.999% likely to be exploited in the next 30 days, higher than 99.998% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.5CVSS 3.1, Highfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What to do

  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
n/an/a
  • n/a (affected)

Timeline

  1. 10 Oct 2023 Published
  2. 10 Oct 2023 CVE-2023-44487 added to CISA KEV
  3. 10 Oct 2023 Added to the CISA KEV catalogue

Weakness

References