CVE-2026-55005 | BDVDB-2026-348281 Detail

MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 23

Description#

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

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

No public exploit known

8.8 High

1.0%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 63.4.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Memory Corruption

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

8.8 High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).