CVE-2022-26503

SYSTEM code execution via unsafe .NET deserialization

Published Mar 17, 2022 · Updated Aug 3, 2024

Deserialization in Veeam Agent for Microsoft Windows 2.0, 2.1, 2.2, 3.0.2, 4.x, and 5.x allows local users to execute code as SYSTEM. The Windows service on TCP 9395 improperly deserializes attacker-supplied .NET data, causing embedded code to run under the service account. A local user account and access to the service port are required, after which arbitrary code gains complete LOCAL SYSTEM control.

CVSS severity7.8
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Veeam Agent for Microsoft Windows 2.0, 2.1, 2.2, 3.0.2, 4.x, and 5.x allows local users to execute code as SYSTEM. The Windows service on TCP 9395 improperly deserializes attacker-supplied .NET data, causing embedded code to run under the service account. A local user account and access to the service port are required, after which arbitrary code gains complete LOCAL SYSTEM control.

The record

CVE
CVE-2022-26503
Published
Mar 17, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDAV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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