LiveActive security incident?Get immediate response
CVE Record

CVE-2017-12310: A vulnerability in the auto discovery phase of Cisco Spark Hybrid Calendar Service could allow an unauthent...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This issue could expose Office 365 email and calendar data during Cisco Spark Hybrid Calendar Service autodiscovery. The problem is an unencrypted HTTP request whose headers may contain sensitive information. The business risk depends on whether the service was used and whether attackers could observe that network traffic.

Executive priority

Treat as a targeted exposure review, not an emergency based on available evidence. Prioritize if the organization used Cisco Spark Hybrid Calendar Service with Office 365 and had traffic crossing untrusted or shared networks.

Technical view

CVE-2017-12310 is a CWE-200 information disclosure flaw in Cisco Spark Hybrid Calendar Service autodiscovery. Because an unencrypted HTTP request is made during implementation-required discovery, a remote unauthenticated attacker monitoring the network could view sensitive request headers and use them for reconnaissance or customer data exposure.

Likely exposure

Exposure is limited to environments using Cisco Spark Hybrid Calendar Service with Office 365 integration where autodiscovery traffic could be observed on the network path.

Exploitation context

The source bundle does not show KEV listing or confirmed active exploitation. Exploitation requires the attacker to monitor unencrypted network traffic, then use exposed header information for further reconnaissance or disclosure.

Researcher notes

Evidence is limited to the CVE description and Cisco advisory reference. No CVSS vector, fixed version, or confirmed exploit activity is provided in the bundle. Avoid assuming impact beyond Cisco Spark Hybrid Calendar Service and Office 365 email/calendar data.

Mitigation direction

  • Review Cisco advisory cisco-sa-20171023-spark for vendor remediation guidance.
  • Confirm whether Cisco Spark Hybrid Calendar Service was deployed or retired.
  • Reduce exposure of autodiscovery traffic on untrusted network paths.
  • Assess Office 365 calendar and email data access risk for affected users.
  • Apply any Cisco-recommended updates or configuration changes documented by the vendor.

Validation and detection

  • Inventory Cisco Spark Hybrid Calendar Service integrations with Office 365.
  • Confirm whether autodiscovery was enabled during the relevant operating period.
  • Review network architecture for points where unencrypted HTTP traffic could be observed.
  • Check Cisco advisory and internal change records for completed remediation.
  • Review logs for unusual Office 365 calendar or email access patterns.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-200: Information exposure and cloud metadata lookup

Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2017-12310 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aCisco Spark Hybrid Calendar ServiceCisco Spark Hybrid Calendar ServiceListed
Weakness

CWE details

CWE-200

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-200 · source CWE mapping

Exposure of Sensitive Information to an Unauthorized Actor

Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs