How severe is CVE-2026-21670?

CVE-2026-21670 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-21670 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21670?

CVE-2026-21670 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21670?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-21670 have an EU (EUVD) identifier?

Yes. CVE-2026-21670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11581.

When was CVE-2026-21670 published?

CVE-2026-21670 was published on 2026-03-12 and last updated on 2026-06-17.

CVE-2026-21670

CVE-2026-21670 is a high-severity vulnerability in Veeam Veeam Backup & Replication with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-522.

Key facts

Severity: High (CVSS 3.x base score 7.7)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11581
Weakness: CWE-522
Affected product: Veeam Veeam Backup & Replication
Published: 2026-03-12
Last modified: 2026-06-17

Description

A vulnerability allowing a low-privileged user to extract saved SSH credentials.

Frequently asked questions

What is CVE-2026-21670?: A vulnerability allowing a low-privileged user to extract saved SSH credentials.
How severe is CVE-2026-21670?: CVE-2026-21670 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-21670 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21670?: CVE-2026-21670 affects Veeam Veeam Backup & Replication. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21670?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-21670 have an EU (EUVD) identifier?: Yes. CVE-2026-21670 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11581.
When was CVE-2026-21670 published?: CVE-2026-21670 was published on 2026-03-12 and last updated on 2026-06-17.

References

https://www.veeam.com/kb4831

Affected products (1)

cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*

More vulnerabilities in Veeam Veeam Backup & Replication

CVE-2026-21708 — Critical (CVSS 9.9): A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
CVE-2026-21669 — Critical (CVSS 9.9): A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
CVE-2026-21667 — Critical (CVSS 9.9): A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
CVE-2026-21666 — Critical (CVSS 9.9): A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
CVE-2025-48983 — Critical (CVSS 9.9): A vulnerability in the Mount service of Veeam Backup & Replication, which allows for remote code execution (RCE) on the…
CVE-2024-40711 — Critical (CVSS 9.8): A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code…

All CVEs affecting Veeam Veeam Backup & Replication →

Other CWE-522 (Insufficiently Protected Credentials) vulnerabilities

CVE-2026-7312 — Critical (CVSS 10.0): CWE‑522: Insufficiently Protected Credentials in web services in Progress Sitefinity version from 14.0.7700 to…
CVE-2026-29128 — Critical (CVSS 10.0): IDC SFX2100 Satellite Receiver firmware ships with multiple daemon configuration files for routing components (e.g.,…
CVE-2025-54863 — Critical (CVSS 10.0): Radiometrics VizAir is vulnerable to exposure of the system's REST API key through a publicly accessible configuration…
CVE-2024-12799 — Critical (CVSS 10.0): Insufficiently Protected Credentials vulnerability in OpenText Identity Manager Advanced Edition on Windows, Linux, 64…
CVE-2024-51545 — Critical (CVSS 10.0): Username Enumeration vulnerabilities allow access to application level username add, delete, modify and list…
CVE-2023-1778 — Critical (CVSS 10.0): This vulnerability exists in GajShield Data Security Firewall firmware versions prior to v4.28 (except v4.21) due to…

Browse all CWE-522 (Insufficiently Protected Credentials) vulnerabilities →