Vulnerability Report

CVE-2024-27919

Title: Envoyproxy Envoy Denial of Service (DoS)

Denial of Service (DoS)

Proof Of Concept

PoC Available for CVE-2024-27919

CWE Category CWE-390
Published Date Apr 04, 2024
Modified Date Nov 04, 2025
Exploit Status Available
Score 7.5 CVSS v3.1
Exploit Probability (EPSS)
86.75%

Vulnerability Summary

CVE-2024-27919: 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.

Impacted Vendors

E
envoyproxy 1
E
enphase 1

Reference Links

http://www.openwall.com/lists/oss-security/2024/04/03/16 http://www.openwall.com/lists/oss-security/2024/04/05/3 https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5 https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r http://www.openwall.com/lists/oss-security/2024/04/03/16 http://www.openwall.com/lists/oss-security/2024/04/05/3 https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5 https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r https://www.kb.cert.org/vuls/id/421644
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.5
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2024-27919 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/lockness-Ko/CVE-2024-27316
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Stack

No specific products linked.