CASCACascade Atlas

Evidence dossier

CVE-2020-0688

CVE-2020-0688

82.0–97.5Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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'.

State
PUBLISHED
Published
Feb 11, 2020
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS99.97%

2026-07-18 · v2026.06.15 · percentile 100.0%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

microsoftoriginal assertion
container

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'.

CISA KEVoriginal assertion
observed_exploitation

Microsoft Exchange Server Validation Key Remote Code Execution Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.999650000000; percentile 0.999760000000

Applicability

Cited product scope

Trace impact →
MicrosoftMicrosoft Exchange Server 2010 Service Pack 3 Update Rollup 30
[{"status": "affected", "version": "unspecified"}]unknown
MicrosoftMicrosoft Exchange Server 2013
[{"status": "affected", "version": "Cumulative Update 23"}]unknown
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 14
[{"status": "affected", "version": "unspecified"}]unknown
MicrosoftMicrosoft Exchange Server 2016 Cumulative Update 15
[{"status": "affected", "version": "unspecified"}]unknown
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 3
[{"status": "affected", "version": "unspecified"}]unknown
MicrosoftMicrosoft Exchange Server 2019 Cumulative Update 4
[{"status": "affected", "version": "unspecified"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2010:sp3_rollup_30:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_3:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_4:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.0
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.