CVE-2024-31309

Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack

HIGH
7.5
CVSS Score
Published: April 10, 2024 at 12:07 PM UTC
Updated: June 17, 2026 at 07:28 AM UTC
3 products affected across 3 vendorsDebian LinuxFedoraTraffic Server

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Severity
HIGH7.5
Exploit prediction
EPSS 95%
SSVC
No known exploit

Description

HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.  Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute.  ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

8.0.0 ≤ v ≤ 8.1.98.0.0 ≤ v < 8.1.109.0.0 ≤ v ≤ 9.2.39.0.0 ≤ v < 9.2.48.0.09.0.0
Affected range stops below 8.1.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

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