CVE-2024-31309Network attack vector

Service interruption via unbounded HTTP/2 CONTINUATION frames

Published Apr 10, 2024 · Updated Nov 4, 2025

Uncontrolled resource consumption in Apache Traffic Server 8.0.0 through 8.1.9 and 9.0.0 through 9.2.3 allows remote attackers to interrupt service. Http2ConnectionState::rcv_continuation_frame accepts an unbounded rate of CONTINUATION frames per stream instead of counting and rejecting excess frames. Any remote client that can establish an HTTP/2 connection can drive repeated frame processing and consume server resources, degrading or interrupting proxy service.

CVSS severity7.5
High
EPSS probability94.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Apache Traffic Server 8.0.0 through 8.1.9 and 9.0.0 through 9.2.3 allows remote attackers to interrupt service. Http2ConnectionState::rcv_continuation_frame accepts an unbounded rate of CONTINUATION frames per stream instead of counting and rejecting excess frames. Any remote client that can establish an HTTP/2 connection can drive repeated frame processing and consume server resources, degrading or interrupting proxy service.

The record

CVE
CVE-2024-31309
Published
Apr 10, 2024
Updated
Nov 4, 2025
Vendor
The Apache Software Foundation
Product
Apache Traffic Server
Classifications
CWE-20, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.0.0 <=8.1.9
  2. Affected versionversion=9.0.0 <=9.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Traffic Serverversion=8.0.0 <=8.1.9; version=9.0.0 <=9.2.3

Published CVSS scores

7.5OSVCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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