CVE-2024-27919
HighIn versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames.
Published Apr 4, 2024 · Updated Sep 8, 2026 · Also known as BIT-envoy-2024-27919, GHSA-gghf-vfxp-799r
Key Facts
Patch immediately- CVE-2024-27919 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Envoy (Envoyproxy).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 87% probability of exploitation in the next 30 days.
- Fixed versions are available, including Envoy 1.29.2.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
87%
Higher than 99.7% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2024-27919 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| EnvoyEnvoyproxy | 1.29.0, 1.29.1, >= 1.29.0, >= >= 1.29.0, < 1.29.2 | 1.29.2 |
Patched Releases
Envoy
1.29.2
Timeline
Publicly disclosed
Apr 4, 2024
Last updated
Sep 8, 2026
Weakness Type
- CWE-390 Detection of Error Condition Without Action
- CWE-400 Uncontrolled Resource Consumption
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2024/27xxx/CVE-2024-27919.json
- advisoryhttp://www.openwall.com/lists/oss-security/2024/04/03/16
- patchhttps://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5
- patchhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r
- articlehttps://nvd.nist.gov/vuln/detail/CVE-2024-27919
FAQ
Common Questions.
Envoy is a cloud-native, open-source edge and service proxy.
Affected: Envoy (Envoyproxy) versions 1.29.0, 1.29.1, >= 1.29.0, >= >= 1.29.0, < 1.29.2. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Envoy 1.29.2.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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