CVE-2020-10915Network attack vector

Unauthenticated remote code execution via HandshakeResult deserialization

Published Apr 22, 2020 · Updated Aug 4, 2024

Deserialization of untrusted data in Veeam ONE Agent 9.5.4.4587 allows remote attackers to execute arbitrary code via TCP 2805. The HandshakeResult method accepts attacker-controlled data without proper validation and deserializes it, causing code execution in the VeeamOneAgentSvc service account context. No authentication is required, so any network-reachable agent listener is exposed to service-account compromise and resulting system control.

CVSS severity9.8
Critical
EPSS probability86.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Veeam ONE Agent 9.5.4.4587 allows remote attackers to execute arbitrary code via TCP 2805. The HandshakeResult method accepts attacker-controlled data without proper validation and deserializes it, causing code execution in the VeeamOneAgentSvc service account context. No authentication is required, so any network-reachable agent listener is exposed to service-account compromise and resulting system control.

The record

CVE
CVE-2020-10915
Published
Apr 22, 2020
Updated
Aug 4, 2024
Vendor
Veeam Software
Product
Veeam ONE Agent
Classifications
CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.5.4.4587

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Veeam Software · Veeam ONE Agentversion=9.5.4.4587

Published CVSS scores

9.8Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NISTAV:N/AC:L/Au:N/C:P/I:P/A:P

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.

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No observations available

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

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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