Threats / Commvault / CVE-2025-3928
CVE-2025-3928
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Commvault Web Server vulnerability
Commvault Web Server contains an unspecified vulnerability allowing authenticated remote attackers to create and execute webshells, enabling post-authentication code execution.
Verdict
Today item — known-exploited.
An authenticated attacker can exploit this vulnerability to establish persistent code execution on affected Commvault Web Server instances through webshell deployment, potentially compromising backup infrastructure and data.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
10 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-04-28).
Probability (EPSS)
EPSS 0.01868 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Commvault, Web Server. Confirm exact fixed builds in the vendor advisory.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I authenticate to the Commvault Web Server using valid credentials.
Business
Legitimate administrative access is a prerequisite; insider threats or credential compromise create initial attack surface.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the unspecified vulnerability to upload and execute a webshell on the server.
Business
Backup systems become compromised, creating risk of data exfiltration, ransomware staging, or infrastructure sabotage.
3
Lateral reach — past segmentation narrative 3
Attacker
I maintain persistent access through the webshell for lateral movement and further exploitation.
Business
Attackers gain foothold in critical backup infrastructure, potentially affecting disaster recovery capabilities and business continuity.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05