CVE-2023-27532Known exploitationPublic exploitNetwork attack vector

Credential disclosure via unauthenticated backup service API

Published Mar 10, 2023 · Updated Oct 21, 2025

Missing authentication in Veeam Backup & Replication allows remote attackers to obtain encrypted configuration-database credentials. The Veeam.Backup.Service.exe API on TCP 9401 accepts credential-list and decryption requests without a valid authentication token, returning credentials in recoverable form. Network access to the backup infrastructure is sufficient, and the disclosed credentials enable access to managed backup hosts.

CVSS severity7.5
High
EPSS probability77.61%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Veeam Backup & Replication allows remote attackers to obtain encrypted configuration-database credentials. The Veeam.Backup.Service.exe API on TCP 9401 accepts credential-list and decryption requests without a valid authentication token, returning credentials in recoverable form. Network access to the backup infrastructure is sufficient, and the disclosed credentials enable access to managed backup hosts.

The record

CVE
CVE-2023-27532
Published
Mar 10, 2023
Updated
Oct 21, 2025
Vendor
Veeam Software
Product
Veeam Backup & Replication
Classifications
CWE-306, T1555
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 2023Exploitation reportedCISA Known Exploited Vulnerabilities listing
  3. Oct 21, 2025Record 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=11a (build 11.0.1.1261 P20230227)
  2. Affected versionversion=Fixed Versions: v12 (build 12.0.0.1420 P20230223)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Veeam Software · Veeam Backup & Replicationversion=11a (build 11.0.1.1261 P20230227); version=Fixed Versions: v12 (build 12.0.0.1420 P20230223)

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1555Credentials from Password Stores

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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