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CVE-2024-32976— Envoy can enter an endless loop while decompressing Brotli data with extra input

Quick assessment

Affected
envoyproxy envoy
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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，该漏洞源于在对Brotli数据进行额外输入解压缩时可能会陷入无限循环。

CVSS 7.5 · High EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2024-32976

Vulnerability Information
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Vulnerability Title
Envoy can enter an endless loop while decompressing Brotli data with extra input
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a cloud-native, open source edge and service proxy. Envoyproxy with a Brotli filter can get into an endless loop during decompression of Brotli data with extra input.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
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，该漏洞源于在对Brotli数据进行额外输入解压缩时可能会陷入无限循环。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.30.0, <= 11.30.1 -

II. Public POCs for CVE-2024-32976

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III. Intelligence Information for CVE-2024-32976

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Vendor Advisories for CVE-2024-32976 (1)

Same Patch Batch · envoyproxy · 2024-06-04 · 7 CVEs total

CVE-2024-34363 7.5 HIGH Envoy can crash due to uncaught nlohmann JSON exception
CVE-2024-23326 5.9 MEDIUM Envoy incorrectly accepts HTTP 200 response for entering upgrade mode
CVE-2024-32974 5.9 MEDIUM Envoy affected by a crash in EnvoyQuicServerStream::OnInitialHeadersComplete()
CVE-2024-32975 5.9 MEDIUM Envoy crashes in QuicheDataReader::PeekVarInt62Length()
CVE-2024-34362 5.9 MEDIUM Envoy affected by a crash (use-after-free) in EnvoyQuicServerStream
CVE-2024-34364 5.7 MEDIUM Envoy OOM vector from HTTP async client with unbounded response buffer for mirror response

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-835

V. Comments for CVE-2024-32976

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