EUVD-2026-75674Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/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
PR:L for required SSM session credential; S:C because stolen IAM creds impact resources outside the agent's scope; A:N as the SSRF causes no direct availability loss.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
8DescriptionCVE.org
A server-side request forgery issue due to improper validation of equivalent address representations in the port forwarding to remote hosts functionality in Amazon AWS Systems Manager Agent (SSM Agent) before 3.3.4851.0 on all platforms might allow an authenticated remote user to bypass the remote destination denylist and reach link-local endpoints, potentially obtaining the temporary IAM role credentials of a managed instance and acting with that role's permissions from outside the instance, via a crafted destination host value that uses an alternate representation of a denied link-local address.
To remediate this issue, users should upgrade to version 3.3.4851.0 or later.
AnalysisAI
SSRF in AWS Systems Manager Agent's port-forwarding feature allows an authenticated remote user to bypass the link-local address denylist and reach the EC2 Instance Metadata Service (IMDS), enabling theft of the managed instance's temporary IAM role credentials. The bypass exploits insufficient canonicalization of IP addresses before denylist evaluation - alternate representations of 169.254.169.254 (hex, decimal, IPv6-mapped, etc.) pass the check unblocked. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold valid AWS IAM credentials that include ssm:StartSession (or ssm:StartPortForwardingSessionToRemoteHost) permission for the target managed instance - this is the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H) scores 8.5 and accurately reflects the attack profile: network-reachable, no special configuration, low privilege required, but scoped confidentiality impact on the vulnerable system (IAM credentials) and high subsequent-system impact (full role-level integrity and availability over AWS resources controlled by the role). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: 3.3.4851.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Systems Manager Agent deployments and their current versions; document which instances have elevated IAM role permissions. …
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External POC / Exploit Code
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