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CVE detail

CVE-2024-30255

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.

CVSS 5.3 · MediumBuzz score 17.5

Buzz score

Why this CVE is surfacing

Buzz score total 17.5

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 11.0 · diversity 6.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
11.0
2 evidence mentions in the snapshot
Diversity score
6.5
2 sources across 1 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
2 source links · newest first
  • HTTP/2 CONTINUATION Flood technique can be exploited in DoS attacksSecurity Affairs

    HTTP/2 CONTINUATION Flood: Researchers warn of a new HTTP/2 vulnerability that can be exploited to conduct powerful denial-of-service (DoS) attacks. HTTP messages can contain named fields in both header and trailer sections. CERT/CC experts explained that both header and trailer fields are serialized as field blocks in HTTP/2 to transmit them in multiple fragments to […]

    newssecurityaffairs.comApr 5, 2024, 2:41 AM
  • New HTTP/2 DoS Attack Potentially More Severe Than Record-Breaking Rapid ResetSecurityWeek

    New HTTP/2 DoS method named Continuation Flood can pose a greater risk than Rapid Reset, which has been used for record-breaking attacks.

    newswww.securityweek.comApr 4, 2024, 10:50 AM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

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