CVE-2024-30255 (GCVE-0-2024-30255)
Vulnerability from cvelistv5 – Published: 2024-04-04 19:41 – Updated: 2025-11-04 18:30
VLAI?
Title
HTTP/2: CPU exhaustion due to CONTINUATION frame flood
Summary
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.
Severity ?
5.3 (Medium)
CWE
- CWE-390 - Detection of Error Condition Without Action
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| envoyproxy | envoy |
Affected:
>= 1.29.0, < 1.29.3
Affected: >= 1.28.0, < 1.28.2 Affected: >= 1.27.0, < 1.27.4 Affected: < 1.26.8 |
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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