EUVD-2026-50234
GHSA-f54r-392m-jmr7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable and unauthenticated, but the required counter-resetting plugin raises AC:H; amplification affects backend availability (S:C, A:H) with no confidentiality or integrity impact.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionCVE.org
Apache Traffic Server allows redirect-limit bypass when plugins reset the retry counter, enabling SSRF amplification.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
AnalysisAI
Server-Side Request Forgery amplification in Apache Traffic Server (versions 8.0.0-8.1.9, 9.0.0-9.2.14, and 10.0.0-10.1.3) allows remote attackers to bypass the configured redirect-follow limit when a plugin resets the internal retry counter, letting a single request fan out into a large chain of proxy-originated requests. The CVSS 4.0 base score is 8.2 (High), reflecting high impact on availability rather than data disclosure, with an attack requirement (AT:P) tied to specific plugin behavior. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an Apache Traffic Server deployment (8.0.0-8.1.9, 9.0.0-9.2.14, or 10.0.0-10.1.3) that is configured to follow HTTP redirects AND is running a plugin that resets the retry/redirect counter during processing - this counter reset is the exact condition that defeats the redirect-limit safeguard (reflected as CVSS AT:P). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L, score 8.2) indicates a network-reachable, unauthenticated, low-complexity issue whose impact is concentrated on availability (VA:H) with a limited subsequent-system availability effect (SA:L) and no confidentiality or integrity impact - consistent with an amplification/DoS-style SSRF rather than internal-data theft. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a crafted request through an ATS instance whose redirect-following passes through a plugin that resets the retry counter, causing ATS to follow a long redirect chain instead of stopping at the configured limit. By pointing the chain at attacker-chosen or internal targets, the single request is amplified into many proxy-originated outbound requests, exhausting resources or hammering a backend. … |
| Remediation | Vendor-released patch: upgrade to Apache Traffic Server 9.2.15 (for the 8.x and 9.x lines) or 10.1.4 (for the 10.x line), as directed in the Apache advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your environment to identify all Apache Traffic Server deployments and pinpoint affected versions across the 8.x, 9.x, and 10.x product lines. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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