TI-2024-35732 Aliases CVE-2024-53270

HTTP/1: sending overload crashes when the request is reset beforehand in envoy

HIGH 66CWE-670Published 2024-12-18 · Updated 2024-12-18

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions `sendOverloadError` is going to assume the active request exists when `envoy.load_shed_points.http1_server_abort_dispatch` is configured. If `active_request` is nullptr, only onMessageBeginImpl() is called. However, the `onMessageBeginImpl` will directly return ok status if the stream is already reset leading to the nullptr reference. The downstream reset can actually happen during the H/2 upstream reset. As a result envoy may crash. This issue has been addressed in releases 1.32.3, 1.31.5, 1.30.9, and 1.29.12. Users are advised to upgrade. Users unable to upgrade may disable `http1_server_abort_dispatch` load shed point and/or use a high threshold.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00696 53rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial envoy (envoyproxy): 1.32.3, 1.31.5, 1.30.9 +1Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
envoyproxy	envoy	1.32.0 to before 1.32.3; 1.31.0 to before 1.31.5; 1.30.0 to before 1.30.9; before 1.29.12	1.32.3, 1.31.5, 1.30.9, 1.29.12	Patch available	CNA

envoy Vendorenvoyproxy Affected 1.32.0 to before 1.32.3; 1.31.0 to before 1.31.5; 1.30.0 to before 1.30.9; before 1.29.12 Fixed in 1.32.3, 1.31.5, 1.30.9, 1.29.12 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:envoyproxy:envoy::::::::	before 1.29.12; 1.30.0 to before 1.30.9; 1.31.0 to before 1.31.5; 1.32.0 to before 1.32.3	Vulnerable	envoyproxy

cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions before 1.29.12; 1.30.0 to before 1.30.9; 1.31.0 to before 1.31.5; 1.32.0 to before 1.32.3 Vulnerable ·envoyproxy

Remediation

Fix · CNA envoy (envoyproxy) Fixed in 1.32.3, 1.31.5, 1.30.9, 1.29.12

Red Hat 1 advisory

RHSA-2025:1053 Released 2025-02-05 · Red Hat rating Important
Red Hat OpenShift Service Mesh Containers for 2.6.5
- RHOSSM 2.6 for RHEL 9 openshift-service-mesh/proxyv2-rhel9

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
OpenShift Service Mesh 2	Affected	No fix yet
RHOSSM 2.6 for RHEL 9	Fixed	RHSA-2025:1053

Not affected: 1 product

RHOSSM 2.6 for RHEL 8

Timeline

2026-10-02 Threatist record created from CVE-2024-53270

References

Exploit 1

https://github.com/envoyproxy/envoy/security/advisories/GHSA-q9qv-8j52-77p3

Patch 1

https://github.com/envoyproxy/envoy/pull/37743/commits/6cf8afda956ba67c9afad185b962325a5242ef02

TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-20001 HTTP/2: CPU exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
TI-2024-18524 HTTP/2: memory exhaustion due to CONTINUATION frame flood CVSS 3.1HIGH 7.5
TI-2023-12215 Envoy client may fake the header `x-envoy-original-path` CVSS 3.1CRITICAL 9.1
TI-2023-18002 Envoy vulnerable to OAuth2 credentials exploit with permanent validity CVSS 3.1CRITICAL 9.8

See all 126 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences