Denial of Service Vulnerability in Envoy's HTTP/2 Protocol Stack
CVE-2024-27919

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
4 April 2024

What is CVE-2024-27919?

A vulnerability exists in Envoy's HTTP/2 protocol stack in versions 1.29.0 and 1.29.1 that enables an attacker to exploit the continuous sending of CONTINUATION frames. This occurs when the codec fails to reset a request after the header map limits have exceeded, potentially causing unlimited memory consumption which leads to a denial of service through memory exhaustion. To mitigate this issue, users are advised to upgrade to version 1.29.2 or later. As an alternative workaround, downgrading to version 1.28.1 or earlier, or disabling HTTP/2 protocol for downstream connections, is recommended.

Affected Version(s)

envoy >= 1.29.0, < 1.29.2

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM
https://github.com/envoyproxy/envoy/commit/57a02565532c18...
x_refsource_MISC
http://www.openwall.com/lists/oss-security/2024/04/05/3

EPSS Score

86% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

.