# CVE-2017-12310: Information disclosure in Cisco Spark Hybrid Calendar Service

> Unauthenticated attackers can view sensitive Office365 user data in unencrypted HTTP headers during auto-discovery, leading to information disclosure.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2018
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-wg93-6mfv-3545

## What is CVE-2017-12310?

CVE-2017-12310 is a high-severity vulnerability in Cisco Spark Hybrid Calendar Service, published on 27 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the auto discovery phase of Cisco Spark Hybrid Calendar Service could allow an unauthenticated, remote attacker to view sensitive information in the unencrypted headers of an HTTP method request. The attacker could use this information to conduct additional reconnaissance attacks leading to the disclosure of sensitive customer data. The vulnerability exists in the auto discovery phase because an unencrypted HTTP request is made due to requirements for implementing the Hybrid Calendar service. An attacker could exploit this vulnerability by monitoring the unencrypted traffic on the network. An exploit could allow the attacker to access sensitive customer data belonging to Office365 users, such as email and calendar events. Cisco Bug IDs: CSCvg35593.

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2017-12310?

It affects 1 product.


Products: Cisco Spark Hybrid Calendar Service.

## How do I fix CVE-2017-12310?

No fix has been published for CVE-2017-12310 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-12310 being exploited?

There is no known exploitation of CVE-2017-12310 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-12310 and fix it if it is affected.

What it is: CVE-2017-12310 is a high-severity vulnerability in Cisco Spark Hybrid Calendar Service, published on 27 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-12310 in the wild and no public exploit code.

Affected product: Cisco Spark Hybrid Calendar Service. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2017-12310/ (Markdown: https://insights.sbomify.com/CVE-2017-12310/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12310
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12310
- OSV: https://osv.dev/vulnerability/CVE-2017-12310

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-12310/
Summaries are generated and may contain mistakes; the official description above is the record.