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Commvault Cloud CVE-2026-77101

| EUVDEUVD-2026-72727 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-09-08 Commvault GHSA-wfc9-w7cq-xw2g
Buffer Overflow Denial Of Service Stack Overflow Commvault Commvault Cloud
8.7
CVSS 4.0 · Vendor: Commvault
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Severity by source

Vendor (Commvault) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Network-reachable unauthenticated DoS with no scope change; only availability impacted per vendor CVSS 4.0 impact metrics.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (Commvault).

CVSS VectorVendor: Commvault

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Metadata Corrected
Sep 08, 2026 - 13:40 vuln.today
tag: Denial Of Service added
Analysis Generated
Sep 08, 2026 - 13:04 vuln.today
CVE Published
Sep 08, 2026 - 12:12 cve.org
HIGH 8.7

DescriptionCVE.org

CommServe contained a stack-based buffer overflow issue affecting service availability. Software customers upgrade to resolved maintenance release. Update CommServe.

AnalysisAI

Stack-based buffer overflow in the CommServe component of Commvault Cloud allows unauthenticated remote attackers to crash the service, causing a denial of service across all affected release trains (11.36.x, 11.40.x, 11.44.x, 11.46.x). The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) indicates no authentication or special conditions are required to trigger the crash. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation No special conditions are required beyond network reachability to the CommServe management service - the CVSS 4.0 vector AV:N/AC:L/AT:N/PR:N/UI:N indicates unauthenticated exploitation against default configurations of Commvault Cloud CommServe. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 4.0 base score of 8.7 is consistent with a network-reachable, unauthenticated, zero-complexity DoS against a critical enterprise component. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Commvault has released maintenance fixes for all affected branches; customers should upgrade CommServe to a resolved maintenance release beyond the stated vulnerable ceilings: beyond 11.36.122 on the 11.36.x branch, beyond 11.40.71 on the 11.40.x branch, beyond 11.44.19 on the 11.44.x branch, and beyond 11.46.19 on the 11.46.x branch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all Commvault Cloud deployments using versions 11.36.x through 11.46.x and assess business criticality of affected backup and recovery operations. …

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Same weakness CWE-121 – Stack-based Buffer Overflow

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CVE-2026-77101 vulnerability details – vuln.today
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