How severe is CVE-2023-44487?

CVE-2023-44487 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-44487?

Affected package information for CVE-2023-44487 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-44487?

No fixed version has been published for CVE-2023-44487 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2023-44487 actively exploited in the wild?

Yes. There are 20 known exploit references for CVE-2023-44487, including 1 documented proof-of-concept exploit on Exploit-DB and 12 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-44487?

CVE-2023-44487 has an EPSS (Exploit Prediction Scoring System) score of 94.4%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2023-44487 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-44487 (HTTP/2 Rapid Reset Attack Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-10-10. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-10-31. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

CISA KEV·Added 2023-10-10 — agencies required to remediate by 2023-10-31

CVE-2023-44487

Q: Can O3 Security detect CVE-2023-44487 in my codebase?

Yes. O3 Security's Impact-Aware SCA scanner identifies CVE-2023-44487 across all affected ecosystems (multiple ecosystems), correlates it against your dependency graph, and uses function-level reachability to confirm whether the vulnerable code path is actually reachable in your application — eliminating false positives. You can scan your stack for CVE-2023-44487 directly from the O3 platform.

HIGH

Also known asBIT-apisix-2023-44487BIT-aspnet-core-2023-44487BIT-contour-2023-44487BIT-dotnet-2023-44487BIT-dotnet-sdk-2023-44487BIT-envoy-2023-44487

Published

Oct 10, 2023

Updated

May 20, 2026

Affected

0 pkgs

Patched

None yet

Exploits

20 known

EPSS Exploitation Probability

via FIRST.org ↗

94.4%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-52426remotemultiple

HTTP/2 2.0 - Denial Of Service (DOS)

by Madhusudhan Rajappa · Sep 16, 2025

Exploit-DB Source

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2023-44487 in your stack?

O3 detects CVE-2023-44487 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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