TI-2024-21840 Aliases CVE-2024-32974

Envoy affected by a crash in EnvoyQuicServerStream::OnInitialHeadersComplete()

LOW 34CWE-416Published 2024-06-04 · Updated 2026-11-05

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: Will not fix Red Hat: no fix planned

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

Envoy is a cloud-native, open source edge and service proxy. A crash was observed in `EnvoyQuicServerStream::OnInitialHeadersComplete()` with following call stack. It is a use-after-free caused by QUICHE continuing push request headers after `StopReading()` being called on the stream. As after `StopReading()`, the HCM's `ActiveStream` might have already be destroyed and any up calls from QUICHE could potentially cause use after free.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00693 53rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Will not fix Red Hat: no fix planned

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
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	1.30.0 – 1.30.1; 1.29.0 – 1.29.4; 1.28.0 – 1.28.3; up to 1.27.5	—	No fix listed	CNA

envoy Vendorenvoyproxy Affected 1.30.0 – 1.30.1; 1.29.0 – 1.29.4; 1.28.0 – 1.28.3; up to 1.27.5 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:envoyproxy:envoy::::::::	before 1.27.6; 1.28.0 to before 1.28.4; 1.29.0 to before 1.29.5; 1.30.0 to before 1.30.2	Vulnerable	envoyproxy

cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:* Versions before 1.27.6; 1.28.0 to before 1.28.4; 1.29.0 to before 1.29.5; 1.30.0 to before 1.30.2 Vulnerable ·envoyproxy

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
OpenShift Service Mesh 2	Affected	No fix planned: Will not fix

Timeline

2026-10-02 Threatist record created from CVE-2024-32974
2026-11-05 Affected versions changed · CNA

References

Exploit 1

https://github.com/envoyproxy/envoy/security/advisories/GHSA-mgxp-7hhp-8299

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