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CVE intelligence

CVE-2023-45288

Vulnerability intelligence

Published Apr 4, 2024Sources checked Sep 30, 2026
7.5HIGHCVSS out of 10
What this means

Review the available evidence

CVE-2023-45288 and is rated High severity with a CVSS score of 7.5. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

CBL-Mariner Releases

Vendor-listed releases
  • 1.7.7-1
  • 3.5.18-1
  • 25.0.7-1
  • 1.7.13-6
  • 1.31.0-1
  • 1.7.0-2
  • 1.12.12-1
  • 1.7.7-6
  • 2.27.0-1
  • 3.6.1-1
  • 0.24.2-10
  • 1.57.0-11
  • 0.12.0-1
  • 1.2.0-13
  • 25.0.3-10
  • 2.7.3-6
  • 1.30.1-1
  • 3.15.2-1
  • 1.10.1-2
  • 3.2.0.azl2-1
  • 1.6.26-5
  • 24.0.9-2
  • 0.59.0-16
  • 1.7.7-4
  • 1.8.17-2
  • 1.14.2-3
  • 0.8.17-3
  • 1.29.4-3
  • 4.0.2-3
  • 0.63.0-2
  • 3.2.0.azl4-1
  • 2.45.4-4
  • 3.5.1-1
  • 24.0.9-3
  • 10.25.1-1
  • 2.37.9-2
  • 3.14.2-2
  • 1.28.4-7
  • 16.0.2-8
  • 2.17.3-3
  • 1.11.2-9
  • 3.5.12-2
  • 1.11.1-8
  • 10.24.0-1
  • 1.8.17-3
  • 1.29.0-2
  • 2.1.2-3
  • 3.6.2-3
  • 0.29.0-1
  • 0.63.0-1
  • 2.62.0-1
  • 19.0.4-2
  • 0.0.10-1
  • 20240213-2
  • 0.8.15-4
  • 0.0.24-3
  • 1.11.1-2
  • 2.3.0-1
  • 8.7.3-6
  • 1.15.0-2
  • 0.14.0-1
  • 3.10.116-2
  • 1.14.4-3
  • 1.9.5-7
CISA KEVNot listedBased on the latest collected catalog
EPSS92.0%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview

What is CVE-2023-45288?

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.