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NVD / CVE Program· CNA hackerone

CVE-2026-21671: A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availabilit

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.3% (FIRST EPSS); higher than 72.1% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Veeam Software Appliance 13.0.1.

Low priority for now. Upgrade to Veeam Software Appliance 13.0.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
Mar 12, 2026
Updated
Jun 17, 2026
EPSS
1.3% · 72th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · hackerone
9.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-21671

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
veeamveeam backup \& replication

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • veeam veeam backup & replication13.0.0.496 and later · up to 13.0.1.1071 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

  • Veeam Software Appliance

    • 13.0.1 and later · before 13.0.1affected · semver

Same product

veeam: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-40711A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).KEV
    96Now
  • CVE-2023-27532Vulnerability in Veeam Backup & Replication component allows encrypted credentials stored in the configuration database to be obtained.KEV
    84Now
  • CVE-2022-26501Veeam Backup & Replication 10.x and 11.x has Incorrect Access Control (issue 1 of 2).KEV
    70This week

Published before and after this one in the same product

  • ← EarlierCVE-2026-21669Mar 12, 2026 · A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
    39Monitor
  • ← EarlierCVE-2026-21670Mar 12, 2026 · A vulnerability allowing a low-privileged user to extract saved SSH credentials.
    26Monitor
  • Later →CVE-2026-21708Mar 12, 2026 · A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Veeam Software Appliance13.0.1Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-23121267 days apartA vulnerability allowing remote code execution (RCE) on the Backup Server by an authenticated domain user
    42Plan
  • CVE-2026-216690 days apartA vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-94 · Improper Control of Generation of Code ('Code Injection')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records