HTTP/2 Rapid Reset Attack Vulnerability
n/a — n/a
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.
7.5
100.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- Oct 10, 2023
- Modified
- Aug 11, 2026
- Added to KEV
- Oct 10, 2023
- Federal patch due
- Oct 31, 2023
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
8 foundWeaponization
Public repositories whose name or description references CVE-2023-44487, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- bcdannyboy/CVE-2023-44487★ 248
Basic vulnerability scanning to see if web servers may be vulnerable to CVE-2023-44487
updated Oct 4, 2026
- secengjeff/rapidresetclient★ 76
Tool for testing mitigations and exposure to Rapid Reset DDoS (CVE-2023-44487)
updated Oct 26, 2026
- imabee101/CVE-2023-44487★ 56
Proof of concept for DoS exploit
updated Aug 15, 2026
- studiogangster/CVE-2023-44487★ 22
A python based exploit to test out rapid reset attack (CVE-2023-44487)
updated Jul 31, 2026
- nxenon/cve-2023-44487★ 15
Examples for Implementing cve-2023-44487 ( HTTP/2 Rapid Reset Attack ) Concept
updated Jul 31, 2026
- threatlabindonesia/CVE-2023-44487-HTTP-2-Rapid-Reset-Exploit-PoC★ 12
updated Sep 28, 2026
- ndrscodes/http2-rst-stream-attacker★ 6
Highly configurable tool to check a server's vulnerability against CVE-2023-44487 by rapidly sending HEADERS and RST_STREAM frames and documenting the server's responses.
updated Mar 2, 2026
- tpirate/cve-2023-44487-POC★ 2
poc for the rst dos attack discovered in 2023
updated Mar 24, 2026
References
- openwall.com
- openwall.com
- openwall.com
- openwall.com
- openwall.com
- openwall.com
- openwall.com
- openwall.com
- access.redhat.com
- arstechnica.com
- aws.amazon.com
- blog.cloudflare.com
- blog.cloudflare.com
- blog.litespeedtech.com
- blog.qualys.com
- blog.vespa.ai
- bugzilla.proxmox.com
- bugzilla.redhat.com
- bugzilla.suse.com
- cgit.freebsd.org
Frequently asked questions
What is CVE-2023-44487?
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.
How severe is CVE-2023-44487?
CVE-2023-44487 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).
Is CVE-2023-44487 actively exploited in the wild?
Yes. CVE-2023-44487 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Oct 10, 2023, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2023-44487?
100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2023-44487?
We found 8 public GitHub repositories referencing CVE-2023-44487, though none matched a known Nuclei template or Metasploit module at last check. Review each one before relying on it - see the proof-of-concept section above.
What type of vulnerability is CVE-2023-44487?
CVE-2023-44487 is classified under CWE-400 (CWE-400 Uncontrolled Resource Consumption).
Cross-checked against
Impactr finds and proves whether CVE-2023-44487 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.