CVE-2024-27919

HTTP/2: memory exhaustion due to CONTINUATION frame flood

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 55.16% Top 5%
Affected: envoyproxy envoy
Published at:
Updated at:

References

Link Tags
https://github.com/envoyproxy/envoy/security/advisories/GHSA-gghf-vfxp-799r
https://github.com/envoyproxy/envoy/commit/57a02565532c18eb9df972a3e8974be3ae59f2d5
http://www.openwall.com/lists/oss-security/2024/04/05/3
http://www.openwall.com/lists/oss-security/2024/04/03/16

Frequently Asked Questions

What is the severity of CVE-2024-27919?
CVE-2024-27919 has been scored as a high severity vulnerability.
How to fix CVE-2024-27919?
To fix CVE-2024-27919, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-27919 being actively exploited in the wild?
It is possible that CVE-2024-27919 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~55% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-27919?
CVE-2024-27919 affects envoyproxy envoy.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.