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CVE-2023-44487: HTTP/2 Rapid Reset Attack Vulnerability

criticalknown exploitedpublic exploitCVE-2023-44487
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).

CSIRTS triage

vendor: HTTP/2product: HTTP/2Denial of service
What
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
Who is affected
Deployments using HTTP/2.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Implement rate limiting and apply updates as they become available.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-10-10
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-44487

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-44487coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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