OMENWAVE modelled vulnerability-chaining pathways

CVE-2021-26855

Microsoft Exchange Server Remote Code Execution Vulnerability

9.1
CVSS Critical
100.0%
EPSS p100
YES
In CISA KEV
YES
Ransomware-linked

Data as of 2 Nov 2026 · NVD, CISA KEV, EPSS

Why chaining, at machine speed

Defenders still triage vulnerabilities one CVE at a time, while increasingly automated attackers combine them at machine speed. Omenwave models the plausible pathways by which this CVE could be chained with others — surfacing them for research and awareness, with evidence for each step.

Modelled capability profile
Kill-chain stage
RECON
Requires
NONE access, NETWORK vector
Grants
NONE access
Capabilities
information disclosurelateral movementdata tampering
Model confidence
high · CVSS 3.1
Top plausible next hops
CVE-2022-41040RECON → EXECUTIONmedium plausibility · KEV

The source discloses information that may contain usable credentials, which could satisfy the destination's authentication requirement (lower confidence).

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2020-0688RECON → EXECUTIONmedium plausibility · KEV

The source discloses information that may contain usable credentials, which could satisfy the destination's authentication requirement (lower confidence).

A remote code execution vulnerability exists in Microsoft Exchange software when the software fails to properly handle objects in memory, aka 'Micros…

CVE-2022-41082RECON → EXECUTIONmedium plausibility · KEV

The source discloses information that may contain usable credentials, which could satisfy the destination's authentication requirement (lower confidence).

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2014-3120RECON → RECONmedium plausibility · KEV

The source discloses information that may contain usable credentials, which could satisfy the destination's authentication requirement (lower confidence).

The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions…

CVE-2023-21529RECON → EXECUTIONmedium plausibility · KEV

The source discloses information that may contain usable credentials, which could satisfy the destination's authentication requirement (lower confidence).

Microsoft Exchange Server Remote Code Execution Vulnerability

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Modelled plausible chaining potential derived from public CVE metadata (CVSS, CWE, CPE). Not a confirmed real-world exploit chain and contains no exploitation detail. For research and awareness only.

Methodology · Interactive explorer · JSON: /cve/CVE-2021-26855