CVEvulnerability

CVE-2024-30255

7.5 HIGH Published 2024-04-04 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2024-04-04
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-390

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.

Affected configurations

• envoyproxy envoy (< 1.26.8) • envoyproxy envoy (>= 1.27.0 < 1.27.4) • envoyproxy envoy (>= 1.28.0 < 1.28.2) • envoyproxy envoy (>= 1.29.0 < 1.29.3)

Related

Weakness · CWE (1)

  • CWE-390 Detection of Error Condition Without Action weakness

References