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CVE-2024-30255— HTTP/2: CPU exhaustion due to CONTINUATION frame flood

Quick assessment

Affected
envoyproxy envoy
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy是一款开源的分布式代理服务器。 Envoy存在安全漏洞，该漏洞源于HTTP/2协议栈容易因为连续帧泛滥而导致CPU耗尽。受影响的产品和版本：Envoy 1.29.3之前版本，1.28.2之前版本，1.27.4之前版本，1.26.8 之前版本。

CVSS 5.3 · Medium EPSS 87.81% · P100

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-30255

Vulnerability Information
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Vulnerability Title
HTTP/2: CPU exhaustion due to CONTINUATION frame flood
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native, open source edge and service proxy. The HTTP/2 protocol stack in Envoy versions prior to 1.29.3, 1.28.2, 1.27.4, and 1.26.8 are vulnerable to CPU exhaustion due to flood of CONTINUATION frames. Envoy's HTTP/2 codec allows the client to send an unlimited number of CONTINUATION frames even after exceeding Envoy's header map limits. This allows an attacker to send a sequence of CONTINUATION frames without the END_HEADERS bit set causing CPU utilization, consuming approximately 1 core per 300Mbit/s of traffic and culminating in denial of service through CPU exhaustion. Users should upgrade to version 1.29.3, 1.28.2, 1.27.4, or 1.26.8 to mitigate the effects of the CONTINUATION flood. As a workaround, disable HTTP/2 protocol for downstream connections.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未有动作错误条件的检测
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在安全漏洞，该漏洞源于HTTP/2协议栈容易因为连续帧泛滥而导致CPU耗尽。受影响的产品和版本：Envoy 1.29.3之前版本，1.28.2之前版本，1.27.4之前版本，1.26.8 之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.29.0, < 1.29.3 -

II. Public POCs for CVE-2024-30255

# POC Description Source Link Shenlong Link
1 CVE-2024-30255 This repository contains a proof-of-concept (PoC) Python script to demonstrate the CPU exhaustion vulnerability in Envoy caused by a flood of CONTINUATION frames. https://github.com/blackmagic2023/Envoy-CPU-Exhaustion-Vulnerability-PoC POC Details
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III. Intelligence Information for CVE-2024-30255

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Vendor Advisories for CVE-2024-30255 (1)

Mailing List Discussions for CVE-2024-30255 (2)

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-390

V. Comments for CVE-2024-30255

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