CVE-2026-21709 | Veeam Backup and Replication/Software Appliance Windows Driver Signature Enforcement command injection (kb4830 / EUVD-2026-23438)

VDB-358083 · CVE-2026-21709 · KB4830 VEEAM BACKUP AND REPLICATION/SOFTWARE APPLIANCE WINDOWS DRIVER SIGNATURE ENFORCEMENT COMMAND INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.4 $0-$5k 6.15+ Summaryinfo A vulnerability was found in Veeam Backup and Replication and Software Appliance. It has been classified as critical. Affected by this vulnerability is an unknown functionality of the component Windows Driver Signature Enforcement. Performing a manipulation results in command injection. This vulnerability was named CVE-2026-21709. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is recommended. Detailsinfo A vulnerability classified as critical has been found in Veeam Backup and Replication and Software Appliance (unknown version). This affects an unknown code block of the component Windows Driver Signature Enforcement. The manipulation with an unknown input leads to a command injection vulnerability. CWE is classifying the issue as CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: A vulnerability allowing a local attacker with administrator privileges to bypass Windows Driver Signature Enforcement. It is possible to read the advisory at veeam.com. This vulnerability is uniquely identified as CVE-2026-21709 since 01/04/2026. The exploitability is told to be easy. Attacking locally is a requirement. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK. Upgrading eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-23438). Productinfo Type Backup Software Vendor Veeam Name Backup and Replication Software Appliance CPE 2.3info 🔒 🔒 CPE 2.2info 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.7 VulDB Meta Temp Score: 6.4 VulDB Base Score: 6.7 VulDB Temp Score: 6.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Command injection CWE: CWE-77 / CWE-74 / CWE-707 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Timelineinfo 01/04/2026 CVE reserved 04/17/2026 +102 days Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Advisory: kb4830 Status: Confirmed CVE: CVE-2026-21709 (🔒) GCVE (CVE): GCVE-0-2026-21709 GCVE (VulDB): GCVE-100-358083 EUVD: 🔒 Entryinfo Created: 04/17/2026 18:44 Updated: 04/17/2026 19:16 Changes: 04/17/2026 18:44 (55), 04/17/2026 19:16 (1) Complete: 🔍 Cache ID: 99:55E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸