How severe is CVE-2025-53512?

CVE-2025-53512 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2025-53512?

CVE-2025-53512 affects the following packages: github.com/juju/juju (Go). Ecosystems affected: Go.

How do I fix CVE-2025-53512?

Update github.com/juju/juju to 0.0.0-20250619024904-402ff008dcc2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-53512 is resolved across your whole dependency graph.

How do I detect CVE-2025-53512 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/juju/juju, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-53512 if there is no patch (or I can't update yet)?

Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Is CVE-2025-53512 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-53512 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-53512?

CVE-2025-53512 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 32th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2025-53512?

CVE-2025-53512 is classified as Information Exposure (CWE-200), CWE-285 (CWE-285). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-53512 published, and has it been updated?

CVE-2025-53512 was published on July 8, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

MEDIUM severity

CVE-2025-53512 — juju

MEDIUMFix: juju/juju@402ff00

CVE-2025-53512 is a medium-severity (CVSS 6.5) Information Exposure vulnerability in github.com/juju/juju. A fix is available for github.com/juju/juju — see the affected versions and patch details below.

Sensitive log retrieval in Juju

Also known asGHSA-r64v-82fh-xc63GO-2025-3806

Published

Jul 8, 2025

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-53512.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs32th percentile — riskier than 32% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/juju/juju

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

Any user with a Juju account on a controller can read debug log messages from the /log endpoint. No specific permissions are required - it's just sufficient for the user to exist in the controller user database. The log messages may contain sensitive information.

Details

The /log endpoint is accessible at the following endpoints:

wss://<controller-ip>/log
wss://<controller-ip>/model/<model-uuid>/log

In order to connect to these endpoints, the client must pass an X-Juju-Client-Version header that matches the current version and pass credentials in a Basic Authorization header. Once connected, the service will stream log events even though the user is not authorised to view them.

To reproduce:

juju bootstrap
juju add-user testuser
juju change-user-password testuser

Run the wscat command below to connect to wss://<controller-ip>:17070/api. Update the JSON payload to include the username and password that were created above.

wscat --no-check -c wss://contorller-ip:17070/model/modelUUID/api
{ "type": "Admin", "request": "Login", "version": 3, "params": { "client-
version": "3.6.1.0", "auth-tag": "user-testuser", "credentials": "
password" } }

Observe that the connection fails due to a lack of permissions.

Run the command below to connect to the log endpoint. Note that the credentials are passed in the --auth flag.

wscat --auth user-testuser:password -H "X-Juju-ClientVersion: 3.6.4" --no-check -c wss://<controller-ip>:17070/log

Observe that the logs are returned in the server’s response.

Code

The /log handlers are registered here https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L867 https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L980

And the only auth required is that the incoming request be for an authenticated user

https://github.com/juju/juju/blob/3.6/apiserver/apiserver.go#L713

but no specific permission checks are done.

Workarounds

There are no workarounds.

References

F-01

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/juju/juju`	all versions	0.0.0-20250619024904-402ff008dcc2`go get github.com/juju/juju@v0.0.0-20250619024904-402ff008dcc2`

Affected Products

1 product · 2 configurations

Application

jujucanonical

≥ 3.0 && < 3.6.8

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/juju/juju, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/juju/juju to 0.0.0-20250619024904-402ff008dcc2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-53512 is resolved across your whole dependency graph.
Workarounds
Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

### Impact Any user with a Juju account on a controller can read debug log messages from the `/log` endpoint. No specific permissions are required - it's just sufficient for the user to exist in the controller user database. The log messages may contain sensitive information. ### Details The `/log` endpoint is accessible at the following endpoints: - `wss://<controller-ip>/log` - `wss://<controller-ip>/model/<model-uuid>/log` In order to connect to these endpoints, the client must pass an X-Juju-Client-Version header that matches the current version and pass credentials in a Basic Authoriza