EUVD-2026-42517
GHSA-4qp9-f9vm-49xq
Severity by source
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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
SSH is network-reachable (AV:N; vendor chose AV:A assuming segmented mgmt network) and weak PRNG makes guessing feasible (AC:L, PR:N, UI:N); full host access gives C/I/A High.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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
3DescriptionCVE.org
Use of a cryptographically weak random number generator in the GenerateRandomPassword function in bosh-windows-stemcell-builder allows a remote attacker to brute-force the resulting SSH login via TCP/22. Affected versions: bosh-windows-stemcell-builder versions prior to v2019.98.
AnalysisAI
Predictable SSH credential generation in Cloud Foundry's bosh-windows-stemcell-builder (versions prior to v2019.98) lets attackers brute-force the SSH login on TCP/22 because the GenerateRandomPassword function relies on a cryptographically weak random number generator, drastically shrinking the effective password keyspace. Any Windows stemcell built with an affected release ships with a guessable administrative password, so an attacker who can reach port 22 of a deployed VM can recover interactive access and full control. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Windows VM was built from a bosh-windows-stemcell-builder stemcell of a version prior to v2019.98 (so its SSH password came from the weak GenerateRandomPassword function) AND that the attacker can reach the VM's SSH service on TCP/22. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 score is 7.7 (High) with vector AV:A/AC:L/AT:P/PR:N/UI:N and High confidentiality, integrity and availability impact - reflecting unauthenticated, low-complexity access that fully compromises the host once the password is guessed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to a Windows VM deployed from a vulnerable stemcell targets its SSH service on TCP/22 and, knowing the password came from a weak PRNG, iterates the small predictable keyspace instead of a full brute force. Given the low attack complexity, a successful guess yields interactive administrative access to the host. … |
| Remediation | Vendor-released patch: upgrade bosh-windows-stemcell-builder to v2019.98 or later, then rebuild all Windows stemcells and redeploy the VMs created from vulnerable stemcells so they receive freshly, securely generated credentials - patching the builder alone does not remediate images or running VMs already produced with weak passwords. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Inventory all deployed Windows stemcells and document bosh-windows-stemcell-builder versions; restrict SSH port 22 access to trusted administrative networks only via network segmentation. …
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External POC / Exploit Code
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