HOMEVULNERABILITIESCVE-2024-30255
HIGH

CVE-2024-30255

CWE-390Published: April 4, 2024· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2024-30255 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

envoyproxy1 product(s)
envoy
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm
PATCHhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmm
ADVISORYhttp://www.openwall.com/lists/oss-security/2024/04/03/16
ADVISORYhttp://www.openwall.com/lists/oss-security/2024/04/03/16

All References (7)

→
http://www.openwall.com/lists/oss-security/2024/04/03/16Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2024/04/05/3Mailing List
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmmPatch · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2024/04/03/16Mailing List · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2024/04/05/3Mailing List
→
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j654-3ccm-vfmmPatch · Third Party Advisory
→
https://www.kb.cert.org/vuls/id/421644

Quick Facts

CVE IDCVE-2024-30255
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-390
CISA KEVNo
Affected1 vendor(s)
PublishedApr 4, 2024

Related CVEs (CWE-390)

CVE-2021-40391
9.8
CVE-2026-53434
9.1
CVE-2019-5051
8.8
CVE-2024-49841
7.8
CVE-2025-46367
7.8
CVE-2024-27919
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2024-30255 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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