CVE-2026-47831

Remote SSH access via weak password generation

Published Jul 9, 2026 · Updated Jul 9, 2026

Weak password generation in Cloud Foundry Foundation BOSH Windows Stemcell Builder before 2019.98 allows remote attackers to brute-force SSH logins. The GenerateRandomPassword function uses a noncryptographic pseudorandom generator, producing SSH passwords with insufficient entropy. The attacker must reach TCP port 22 on a stemcell built by an affected release; a successful guess grants the SSH account access.

CVSS severity7.7
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak password generation in Cloud Foundry Foundation BOSH Windows Stemcell Builder before 2019.98 allows remote attackers to brute-force SSH logins. The GenerateRandomPassword function uses a noncryptographic pseudorandom generator, producing SSH passwords with insufficient entropy. The attacker must reach TCP port 22 on a stemcell built by an affected release; a successful guess grants the SSH account access.

The record

CVE
CVE-2026-47831
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Cloud Foundry Foundation
Product
BOSH Windows Stemcell Builder
Classifications
CWE-338, T1110.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2019.98

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Cloud Foundry Foundation · BOSH Windows Stemcell Builderversion=0 <2019.98

Published CVSS scores

7.5Cloud Foundry FoundationCVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.7Cloud Foundry FoundationCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
T1110.001Password Guessing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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