CVE-2024-30255

Description

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.

How to fix CVE-2024-30255

To remediate CVE-2024-30255, upgrade the affected package to a fixed version below.

• —upgrade to 1.26.8 or later

Is CVE-2024-30255 being exploited?

Likely — EPSS is 88.8%, placing CVE-2024-30255 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.

Affected packages (1)

• from 0, < 1.26.8, >= 1.27.0, < 1.27.4, >= 1.28.0, < 1.28.2, >= 1.29.0, < 1.29.3

CVSS scores

References (5)

• WEBgithub.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm
• WEBnvd.nist.gov/vuln/detail/CVE-2024-30255
• WEBwww.kb.cert.org/vuls/id/421644
• WEBwww.openwall.com/lists/oss-security/2024/04/03/16
• WEB