CVE-2023-44487
Actively exploited. CVE-2023-44487 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2023-44487 is indexed in Exploit-DB and GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
A remote, anonymous attacker can exploit a vulnerability in various http/2 implementations to carry out a denial of service attack.
CSIRTS triage
- What
- A vulnerability in various http/2 implementations allows for a denial of service attack.
- Who is affected
- Various http/2 implementations are affected.
- Urgency
- Remediation is urgent due to the high severity and active exploitation.
- Action
- Update http/2 implementations to the latest version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2023-44487 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (8)
- unknownexploitedMultiple vulnerabilities in IBM products (August 21, 2026)cert-fr-avis · 2026-08-21
- highexploited[UPDATE] [high] http/2 implementations: Vulnerability allows denial of servicecert-bund · 2026-08-14
- unknownexploitedMultiple vulnerabilities in IBM products (August 14, 2026)cert-fr-avis · 2026-08-14
- high[UPDATE] [high] Eclipse Jetty: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-07-06
- criticalexploitedGitLab Security Release: 16.5.1, 16.4.2, 16.3.6gitlab · 2023-10-31
- criticalexploitedGitLab Security Release: 16.5.1, 16.4.2, 16.3.6gitlab · 2023-10-31
- unknownexploitedJenkins Security Advisory 2023-10-18jenkins · 2023-10-18
- criticalexploitedCVE-2023-44487: HTTP/2 Rapid Reset Attack Vulnerabilitycisa-kev · 2023-10-10
External references
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