Security readout for executives and security teams
Plain-English summary
VestaCP before 0.9.8-25 has a stored cross-site scripting flaw in IP interface configuration. An attacker could save malicious script content through the affected interface, creating risk to administrators or users who later view it. This can support session theft, unauthorized actions in the panel, or data exposure depending on privileges.
Executive priority
Treat this as a high-priority patch and exposure-reduction item for any internet-facing VestaCP administration panel. The issue affects a hosting control panel, so compromise could impact administrative trust and hosted services.
Technical view
CVE-2021-47873 is CWE-79 stored XSS affecting VestaCP versions prior to 0.9.8-25. The issue is reported in the IP interface configuration, involving the v_interface parameter submitted to the add/ip/ endpoint. CVSS 3.1 is 7.2: AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Likely exposure
Organizations running VestaCP versions earlier than 0.9.8-25 are potentially exposed, especially where the control panel is reachable from untrusted networks. The provided sources do not identify specific operating systems, hosting configurations, or downstream packages beyond VestaCP.
Exploitation context
A public Exploit-DB entry exists, but the source bundle does not show confirmed active exploitation and KEV is false. The vulnerability is network-reachable and low-complexity per CVSS, increasing concern for internet-exposed control panels.
Researcher notes
Evidence is limited to the CVE record, VulnCheck advisory, and Exploit-DB reference. Do not infer broader affected products. No source in the bundle confirms active exploitation. Focus validation on version, exposure, and stored content review rather than reproducing payload behavior.
Mitigation direction
- Inventory all VestaCP instances and identify versions earlier than 0.9.8-25.
- Upgrade VestaCP to 0.9.8-25 or later if available from trusted vendor sources.
- Restrict administrative panel access to trusted networks or VPN where feasible.
- Monitor VestaCP logs for suspicious IP configuration changes or unexpected script-like content.
- If upgrade status is unclear, check current VestaCP and VulnCheck guidance.
Validation and detection
- Confirm whether VestaCP is installed and record the exact version.
- Review exposed services to determine whether the VestaCP panel is internet-accessible.
- Check IP interface configuration fields for unexpected stored script content.
- Verify remediation by confirming the version is 0.9.8-25 or later.
- Review access logs around IP configuration activity for anomalous requests.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
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-2021-47873 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:N/UI:N/S:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49662CVE reference · exploit
- VestaCP Official Vendor HomepageCVE reference · product
- VestaCP Alternative Download SiteCVE reference · product
- VulnCheck Advisory: VestaCP < 0.9.8-25 - Stored Cross-Site ScriptingCVE reference · third-party-advisory
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.