Security readout for executives and security teams
Plain-English summary
CVE-2021-3619 is a low-severity issue in Rapid7 Velociraptor 0.5.9 and earlier. A logged-in, highly privileged user could store script content through a malicious upload, potentially affecting another user who views it. The vendor fixed it in version 0.6.0, and the supplied sources do not show active exploitation.
Executive priority
Treat this as routine security maintenance unless Velociraptor is broadly accessible or privileged accounts are weakly controlled. The business urgency is low, but security tooling is sensitive infrastructure, so patching should be included in the next normal maintenance window.
Technical view
This is a post-authentication persistent XSS flaw in Velociraptor Notebooks tied to MIME filetype sniffing on uploads. CVSS 3.1 is 3.5 with network access, low complexity, high privileges required, user interaction required, and low confidentiality and integrity impact. Scope is unchanged and availability impact is none.
Likely exposure
Exposure is mainly limited to organizations running Velociraptor 0.5.9 or earlier where authenticated console users can upload notebook content. The CVE notes Velociraptor login rights are usually reserved for trusted IT security users, reducing likelihood but not eliminating insider or compromised-account risk.
Exploitation context
The supplied sources do not indicate active exploitation, and the CVE is not listed as KEV. Exploitation requires an authenticated user with high privileges and another user interaction path, which makes this more of a controlled-access application risk than an internet-wide emergency.
Researcher notes
Evidence supports an authenticated persistent XSS fixed in Velociraptor 0.6.0. The sources do not provide exploit-in-the-wild evidence, detailed affected-version ranges beyond 0.5.9 and prior, or separate mitigations. Validation should focus on version state, access control, and upload history.
Mitigation direction
- Upgrade Rapid7 Velociraptor to version 0.6.0 or later.
- Review Rapid7 and Velocidex release guidance before remediation.
- Restrict Velociraptor access to trusted, necessary users only.
- Audit privileged Velociraptor accounts for stale or unnecessary access.
- Monitor notebook uploads for unexpected or suspicious content.
Validation and detection
- Inventory Velociraptor deployments and record running versions.
- Confirm no deployment remains on version 0.5.9 or earlier.
- Verify Velociraptor console access is limited to approved users.
- Review recent notebook upload activity for unexpected content.
- Check whether remediation to 0.6.0 or later is documented.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-3619 mapping review
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Open ATT&CK lookup- Severity
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N0.92.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/Velocidex/velociraptor/pull/1118CVE reference · x_refsource_MISC
- https://github.com/Velocidex/velociraptor/releases/tag/v0.6.0CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.