5.3
MEDIUM
CVE-2024-30255
Envoy HTTP/2 CONTINUATION Frame Flood CPU Exhaustion 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.

INFO

Published Date :

April 4, 2024, 8:15 p.m.

Last Modified :

Nov. 21, 2024, 9:11 a.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2024-30255 has a 7 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2024-30255 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Envoyproxy envoy

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

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.

Python

Updated: 8 months ago
2 stars 0 fork 0 watcher
Born at : April 9, 2024, 3:59 p.m. This repo has been linked 1 different CVEs too.

Proof of concept (PoC) for CVE-2024-27316 (tested), CVE-2024-30255 (untested), CVE-2024-31309 (untested), CVE-2024-28182 (untested), CVE-2024-2653 (untested) and CVE-2024-27919 (untested)

cve-2024-2653 cve-2024-27316 cve-2024-27919 cve-2024-28182 cve-2024-30255 cve-2024-31309

Go

Updated: 2 weeks, 2 days ago
13 stars 2 fork 2 watcher
Born at : April 9, 2024, 8:08 a.m. This repo has been linked 6 different CVEs too.

A proof of concept for CVE-2024-27316 (tested), CVE-2024-31309 (untested), CVE-2024-30255 (untested), CVE-2024-28182 (untested), CVE-2024-2653 (untested) and CVE-2024-27919 (untested)

Updated: 8 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : April 9, 2024, 7:56 a.m. This repo has been linked 5 different CVEs too.

PoC HTTP/2 Continuation Flood DOS Attack

Python

Updated: 7 months ago
2 stars 0 fork 0 watcher
Born at : April 7, 2024, 2:31 p.m. This repo has been linked 9 different CVEs too.

Proof of Concept: HTTP/2 CONTINUATION Flood

http2 poc proof-of-concept vulnerability http2-continuation-flood

Python Dockerfile Go

Updated: 2 months ago
8 stars 2 fork 2 watcher
Born at : April 6, 2024, 3:34 p.m. This repo has been linked 9 different CVEs too.

This repo showcases a proof of concept for HTTP/2 CONTINUATION Flood vulnerabilities, allowing testing and understanding of potential DoS attacks on servers due to protocol implementation flaws. Includes code, documentation, and CVE mapping.

Python

Updated: 8 months, 1 week ago
4 stars 0 fork 0 watcher
Born at : April 5, 2024, 10:09 p.m. This repo has been linked 9 different CVEs too.

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 2 weeks, 2 days ago
6566 stars 1140 fork 1140 watcher
Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 958 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-30255 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-30255 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2024/04/03/16
    Added Reference http://www.openwall.com/lists/oss-security/2024/04/05/3
    Added Reference https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    May. 01, 2024

    Action Type Old Value New Value
    Added Reference GitHub, Inc. http://www.openwall.com/lists/oss-security/2024/04/05/3 [No types assigned]
    Added Reference GitHub, Inc. http://www.openwall.com/lists/oss-security/2024/04/03/16 [No types assigned]
  • CVE Received by [email protected]

    Apr. 04, 2024

    Action Type Old Value New Value
    Added 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.
    Added Reference GitHub, Inc. https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm [No types assigned]
    Added CWE GitHub, Inc. CWE-390
    Added CVSS V3.1 GitHub, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-30255 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-30255 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability