CVE-2023-45288

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 64.9%, top 2% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 92%
CISA-KEV: Not listedEPSS: 92%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no memory is allocated to store the excess headers, but they are still parsed. This permits an attacker to cause an HTTP/2 endpoint to read arbitrary amounts of header data, all associated with a request which is going to be rejected. These headers can include Huffman-encoded data which is significantly more expensive for the receiver to decode than for an attacker to send. The fix sets a limit on the amount of excess header frames we will process before closing a connection.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
99.8%
KEV
Not listed

Published

April 4, 2024

Last Modified

April 15, 2026

References (17)

Vendor Advisories for CVE-2023-45288(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 1 ecosystem)
Go(4)
PackageVulnerable rangeFixed inDependents
golang.org/x/net—0.23.0—
golang.org/x/net/http2—0.23.0—
net/http—1.22.2—
stdlib—1.22.2—

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoChex0punk/cont-flood-poc
    First seen Apr 12, 2024

    PoC for CVE-2023-45288, continuation flood vulnerability

    Open source ↗

Frequently asked(5)

What is CVE-2023-45288?
CVE-2023-45288 is a high vulnerability published on April 4, 2024. An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request's headers exceed MaxHeaderBytes, no…
When was CVE-2023-45288 disclosed?
CVE-2023-45288 was first published in the National Vulnerability Database on April 4, 2024, with the most recent update on April 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-45288 actively exploited?
CVE-2023-45288 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-45288?
CVE-2023-45288 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-45288?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45288, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-45288

Explore →

Is Your Infrastructure Affected by CVE-2023-45288?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs