CVE-2025-49763

Apache Traffic Server: Remote DoS via memory exhaustion in ESI Plugin

HIGH
7.5
CVSS Score
Published: June 19, 2025 at 10:07 AM UTC
Updated: June 17, 2026 at 09:31 AM UTC
1 product affected across 1 vendorTraffic Server

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

ESI plugin does not have the limit for maximum inclusion depth, and that allows excessive memory consumption if malicious instructions are inserted. Users can use a new setting for the plugin (--max-inclusion-depth) to limit it. This issue affects Apache Traffic Server: from 10.0.0 through 10.0.5, from 9.0.0 through 9.2.10. Users are recommended to upgrade to version 9.2.11 or 10.0.6, which fixes the issue.

Affected

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

10.0.0 ≤ v ≤ 10.0.510.0.0 ≤ v < 10.0.69.0.0 ≤ v ≤ 9.2.109.0.0 ≤ v < 9.2.1110.0.09.0.0
Affected range stops below 10.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.2.11, 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

StatusANALYZED
CWE
CWE-400

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