CVE Intelligence
CISA KEV High Insecure deserialization exploit reference

CVE-2022-41082 — Microsoft Exchange Server Remote Code Execution Vulnerability

Microsoft Exchange Server Remote Code Execution Vulnerability

Published Oct 2, 2022 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: microsoft

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Sep 30, 2022 R play ☠ Play Metasploit modules · 1Proofs of concept on GitHub · 9
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • Used in ransomware campaigns (CISA)+10
  • Exploited by 1 threat actor(s) (MITRE ATT&CK)+10
  • Public exploit/PoC (metasploit, github)+18
  • EPSS 100% (30-day exploitation probability)+15
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Sep 30, 2022
EPSS FIRST
99.97%
ahead of 100% of scored CVEs · Oct 15, 2026
Affects
Microsoft
Exchange Server and 5 more
CVSS base
8.0
High · 3 source(s)
Prioritization reference: 8.8 provisional

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Oct 21, 2022 — passed 1456 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Microsoft Exchange Server, Microsoft Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Microsoft Exchange Server 2016 Cumulative Update 22…).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. Apply the fixed version or the patch documented under Remediation.
  4. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
  5. Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Microsoft Exchange Server version 2013-cumulative_update_23version 2016-cumulative_update_22version 2016-cumulative_update_23version 2019-cumulative_update_11version 2019-cumulative_update_12 Vulnerable NIST National Vulnerability Database
Microsoft Microsoft Exchange Server 2013 Cumulative Update 23 ≥ 15.00.0 and < 15.00.1497.044 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Exchange Server 2016 Cumulative Update 22 ≥ 15.0.0 and < 15.01.2375.037 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 ≥ 15.01.0 and < 15.01.2507.016 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Exchange Server 2019 Cumulative Update 11 ≥ 15.02.0 and < 15.02.0986.036 Vulnerable CVE Program (cve.org) e CISA ADP
Microsoft Microsoft Exchange Server 2019 Cumulative Update 12 ≥ 15.02.0 and < 15.02.1118.020 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Adjacent
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
8.8 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
8.0 CVSS 3.1 High 2.1 5.9 secure@microsoft.com via NIST National Vulnerability Database
8.0 CVSS 3.1 High — — microsoft via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: secure@microsoft.com)
Sources assign different scores within the same severity band. For prioritization we use 8.8 (GitHub, Inc. via GitHub Security Advisories) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Sep 30, 2022
Federal deadline
Oct 21, 2022
passed 1456 day(s) ago
Ransomware use
Known

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Metasploit modules
Proofs of concept on GitHub

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

Threat actors exploiting this CVE MITRE ATT&CK

According to MITRE ATT&CK.

Play G1040

Associated ransomware groups ransomware.live

play

EPSS over time FIRST

Oct 12, 2026 → Oct 15, 2026 · 4 reading(s) · max 99.97%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Monitor serialized objects in requests and unexpected processes spawned by the runtime.
  • Hunt retroactively in logs from before Sep 30, 2022 (KEV listing): exploitation may have started earlier.
endpoint telemetry (EDR)application logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · microsoft/microsoft exchange server 2013 cumulative update 23, microsoft/microsoft exchange server 2016 cumulative updat
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • Affected products added · microsoft/exchange server
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 8.0
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • 2022
  • CVE published
    Oct 2, 2022 · microsoft
  • Added to CISA KEV catalog
    Sep 29, 2022 · CISA

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

11 on the record

Elsewhere on this site

Microsoft
every CVE for this vendor
2022-09
what else CISA listed that month
Insecure deserialization
same class
CWE-502
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-87696 Microsoft Exchange Server Elevation of Privilege Vulnerability 3d
  • CVE-2026-87695 Microsoft Exchange Server Elevation of Privilege Vulnerability 3d
  • CVE-2026-87692 Microsoft Exchange Server Elevation of Privilege Vulnerability 3d
  • CVE-2026-77910 Microsoft Exchange Server Elevation of Privilege Vulnerability 3d
  • CVE-2026-70571 Microsoft Exchange Server Remote Code Execution Vulnerability 3d
  • CVE-2026-70279 Microsoft Exchange Server Spoofing Vulnerability 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2022-41082 is "Microsoft Exchange Server Remote Code Execution Vulnerability", rated High. It affects Exchange Server (Microsoft); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.0 describes technical severity. EPSS 99.97% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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