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PatchSiren cyber security CVE debrief

CVE-2023-27532 Veeam CVE debrief

CVE-2023-27532 is a CISA Known Exploited Vulnerability affecting Veeam Backup & Replication Cloud Connect. CISA added it to the KEV catalog on 2023-08-22, marked it as known ransomware campaign use, and set a due date of 2023-09-12 for required action.

Vendor
Veeam
Product
Backup & Replication
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-08-22
Original CVE updated
2023-08-22
Advisory published
2023-08-22
Advisory updated
2023-08-22

Who should care

Veeam administrators, backup and recovery teams, MSSPs, and security teams responsible for exposed or remotely reachable Veeam Backup & Replication Cloud Connect deployments.

Technical summary

CISA describes CVE-2023-27532 as a missing authentication for a critical function in Veeam Backup & Replication Cloud Connect. The supplied KEV metadata identifies the product as Veeam Backup & Replication, records the issue as actively exploited, and flags known ransomware campaign use. No CVSS score is provided in the supplied source set.

Defensive priority

Urgent. Backup infrastructure is a high-value target, and a KEV listing with known ransomware campaign use should be treated as an immediate remediation priority.

Recommended defensive actions

  • Apply vendor mitigations exactly as instructed by Veeam.
  • If mitigations are unavailable or cannot be deployed promptly, discontinue use of the affected product or feature as CISA directs.
  • Inventory Veeam Backup & Replication and Cloud Connect exposure, including externally reachable systems.
  • Restrict network access to backup and management interfaces to trusted administrative paths only.
  • Review backup integrity, administrative access, and monitoring for signs of tampering or unauthorized activity.
  • Prioritize validation of recovery capability after remediation so backup operations remain trustworthy.

Evidence notes

The supplied source corpus is limited to CISA KEV metadata and official reference links. The KEV record explicitly lists Veeam Backup & Replication Cloud Connect, the vulnerability name 'Missing Authentication for Critical Function Vulnerability,' dateAdded 2023-08-22, dueDate 2023-09-12, knownRansomwareCampaignUse set to Known, and the required action to apply vendor mitigations or discontinue use if mitigations are unavailable. No CVSS score is present in the supplied data.

Official resources

CVE-2023-27532 was published on 2023-08-22 and added to CISA's Known Exploited Vulnerabilities catalog the same day, with CISA listing a due date of 2023-09-12 for required action.