CVE-2020-0688

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Microsoft Exchange Memory Corruption Vulnerability'.

Exploited in the wild: Yesadded 2021-11-03 · due 2022-05-03 · known ransomware use. An observation, not a forecast.
EPSS · 30-day forecast: 100.0%Chance of exploitation in the next 30 days, 100th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · HIGH: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Internet exposure: not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

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On the wire

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Tied by cited sources to

APT29
1. “During the SolarWinds Compromise , APT29 exploited CVE-2020-0688 against the Microsoft Exchange Control Panel to regain access to a network.”
  cited as used in a campaign · source: attack.mitre.org ↗ · 2026-10-17
Kimsuky
1. “Kimsuky has exploited various vulnerabilities for initial access, including Microsoft Exchange vulnerability CVE-2020-0688.”
  cited as exploiting · source: attack.mitre.org ↗ · 2026-10-17
MuddyWater
1. “MuddyWater has exploited the Microsoft Exchange memory corruption vulnerability (CVE-2020-0688).”
  cited as exploiting · source: attack.mitre.org ↗ · 2026-10-17

Each actor is cited by the quoted source, linked under the quote. A citation is that source's claim, not our confirmation.

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