Yes. CISA added CVE-2023-27532 to its Known Exploited Vulnerabilities catalogue on 22 August 2023, which it does only when there is reliable evidence of active exploitation. CISA lists it as known to be used in ransomware campaigns. Veeam Backup & Replication Cloud Connect component contains a missing authentication for critical function vulnerability that allows an unauthenticated user operating within the backup infrastructure network perimeter to obtain encrypted credentials stored in the configuration database.
What this CVE means for exposure and active exploitation
For practitioners, the key question is not whether this issue exists, but whether your Veeam Backup & Replication Cloud Connect component is reachable in the backup infrastructure and whether it has been exposed long enough to be targeted. When a vulnerability is in CISA’s KEV catalogue, the operational assumption should be that exploitation is already happening somewhere, not that it is only theoretical.
That matters because backup platforms often sit at a high-value junction: they can hold credentials, restore paths, and trust relationships that attackers want after initial foothold. If this component is reachable by untrusted internal or adjacent systems, the exposure is materially different from a lab-only or isolated deployment.
For broader triage and exploitation context, the most useful starting point is CISA Known Exploited Vulnerabilities Catalog, which is designed for vulnerabilities with confirmed active abuse, and the NIST National Vulnerability Database, which provides the formal CVE record and product metadata.
Why backup infrastructure is a high-value target here
This class of flaw is especially important because it affects a backup-adjacent component that can sit close to privileged infrastructure and sensitive configuration data. In practice, that means exploitation can be useful even when the attacker does not immediately reach production systems, because access to encrypted credentials or backup-plane trust can become a pivot point.
When a vulnerability can be used from inside the backup perimeter, perimeter assumptions matter more than usual. Network placement, segmentation, and which systems can talk to the Cloud Connect component become part of the security question, not just the patch question.
Understanding the product and record context on the CVE Program helps anchor the issue to the official vulnerability identifier, while CISA’s KEV entry tells you whether exploitation urgency is justified by observed abuse rather than by severity alone.
What to do when patching must wait
If you cannot remediate immediately, treat this as an exposure-management problem, not a documentation item. Confirm whether the Cloud Connect component is deployed, whether it is reachable from any untrusted or semi-trusted network segment, and whether its configuration database or related secrets could be accessed by an attacker who gains a foothold nearby.
Temporary controls should narrow the reachable attack surface, restrict administrative access, and remove unnecessary pathways into the backup infrastructure. If the environment cannot be isolated quickly, prioritize compensating controls that reduce who can reach the component and what a compromised adjacent host can query or harvest.
For practical prioritisation, pair the KEV listing with the FIRST EPSS view of exploitation likelihood so you can decide whether this issue belongs in emergency response or in the next normal maintenance window.
Risk and Threat Considerations
This vulnerability is risky because it sits at the intersection of exploitation opportunity and backup trust. If an attacker can reach the affected function within the perimeter, the likely consequence is not just a single configuration leak, but a path into credential material that may support lateral movement, backup tampering, or follow-on compromise.
Failure mechanism: Missing authentication on a critical function allows an unauthenticated requester inside the backup network perimeter to obtain encrypted credentials from the configuration database, creating an attack path from limited access to privileged material.
Impact: The practical impact can include credential exposure, backup-plane compromise, and a stronger starting position for ransomware operators who often target backup systems to weaken recovery options.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack surface, NIST SP 800-53 Rev 5, CIS Controls v8 and NIST CSF 2.0 set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | Credentials exposed by this flaw require stronger lifecycle control and rotation. |
| Recommendation — Rotate any exposed credentials and invalidate affected authenticators immediately. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | CISA KEV status makes rapid identification and remediation of this exploited CVE a priority. |
| Recommendation — Prioritise discovery, remediation and verification for KEV-listed vulnerabilities. | ||
| ISO/IEC 27001:2022 | A.8.8 — Management of technical vulnerabilities | Actively exploited software flaws require formal vulnerability handling and timely remediation. |
| Recommendation — Track, assess and remediate this vulnerability through your technical vulnerability process. | ||
| NIST CSF 2.0 | PR.IP-12 — Vulnerability management | The subject is about handling a known exploited vulnerability in an operational environment. |
| Recommendation — Use vulnerability management to triage, remediate and verify this exploited issue. | ||
| MITRE ATT&CK | T1212 — Exploitation for Credential Access | The flaw exposes credentials, supporting credential-access activity by an attacker. |
| Recommendation — Hunt for credential-access activity and rotate any credentials that may have been exposed. | ||
Practitioner Guidance
What to verify: Confirm whether Veeam Backup & Replication Cloud Connect is deployed, whether it is Internet-reachable or reachable from any broad internal segment, and whether the configuration database or stored credentials could be accessed from the same trust zone.
Decision rule: If the component is exposed anywhere outside a tightly controlled backup segment, treat the issue as urgent exploitation risk, even if you have not seen alerts yet. If the component is isolated and unreachable except from trusted administrative paths, your priority shifts to verification and patch timing rather than emergency containment.
What practitioners underestimate: Backup infrastructure often has more privilege than its network placement suggests, so the main risk is not just direct exploitation of the flaw, but what the attacker can do after obtaining backup-related credentials or trust relationships.
Practitioner takeaway: For a KEV-listed backup vulnerability, the right question is whether it has already become a pivot point in your environment, not whether the vendor component is merely present.
Related resources from NHI Mgmt Group
- Guide: Zero-Day and Exploited Vulnerabilities Guide
- CVE-2023-27532 (Veeam Backup & Replication Cloud Connect Missing Authentication for Critical Function)
- Is CVE-2023-28461 (Array Networks AG and vxAG ArrayOS Missing Authentication for Critical Function) being exploited in the wild?
- Is CVE-2025-32433 (Erlang Erlang/OTP SSH Server Missing Authentication for Critical Function) being exploited in the wild?
- How do you patch or mitigate CVE-2023-28461 (Array Networks AG and vxAG ArrayOS Missing Authentication for Critical Function)?