EUVD-2026-72728
GHSA-q6mj-3xwf-wjgv
Severity by source
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
Remote unauthenticated network service crash; scope unchanged; only availability impacted with no confidentiality or integrity effect.
Primary rating from Vendor (Commvault).
CVSS VectorVendor: Commvault
Lifecycle Timeline
3DescriptionCVE.org
CommServe contained a heap-based buffer overflow issue affecting service availability. Software customers upgrade to resolved maintenance release. Update CommServe.
AnalysisAI
Heap-based buffer overflow in the CommServe component of Commvault Cloud allows remote unauthenticated attackers to crash the CommServe service, causing denial of service to backup and recovery operations. Affected version branches span four maintenance tracks - 11.36.x, 11.40.x, 11.44.x, and 11.46.x - all below their respective patched maintenance releases. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions are required beyond network access to the CommServe service: exploitation is remote, unauthenticated, and requires no user interaction, as reflected in the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor-assigned CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H) accurately captures the primary risk: remote unauthenticated denial of service against a critical enterprise infrastructure component, with no confidentiality or integrity impact. … 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 | The primary remediation is to upgrade CommServe to the resolved maintenance release for the applicable version branch, as directed by Commvault security advisory CV_2026_08_4 (https://documentation.commvault.com/securityadvisories/CV_2026_08_4.html). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all CommServe instances and identify those running versions 11.36.x, 11.40.x, 11.44.x, or 11.46.x below their respective patched maintenance releases per advisory CV_2026_08_4. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today