Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Jul 14, 2026 · NIST NVD

   Detected

   Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

2. Oct 14, 2026 · NIST NVD

   Updated

   Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Affected

• cpe microsoft/exchange server2016
• cpe microsoft/exchange server2019
• cpe microsoft/exchange server subscription editionversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-55005

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-55005

  30-day exploitation probability 1.0%

  first.org
• NIST NVDVulnerability recordCVE-2026-55005

  Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

  nvd.nist.gov

References

• Vendor Advisory · msrc.microsoft.com