Security readout for executives and security teams
Plain-English summary
CVE-2021-3052 is a high-severity reflected XSS issue in the PAN-OS web interface. An authenticated attacker could trick another authenticated PAN-OS administrator into opening a crafted link, causing actions to run as that administrator. This matters most where firewall management interfaces are reachable by multiple admins or low-privileged accounts.
Executive priority
Treat this as a near-term firewall management-plane remediation item. It is not described as actively exploited, but successful abuse could let one authenticated user drive administrator actions, creating material risk to network security controls.
Technical view
The vulnerability is CWE-79 reflected XSS in Palo Alto Networks PAN-OS web interface. The CVSS 3.1 score is 8.0 with AV:N/AC:L/PR:L/UI:R and high confidentiality, integrity, and availability impact. Affected versions are PAN-OS 8.1 before 8.1.20, 9.0 before 9.0.14, 9.1 before 9.1.10, and 10.0 before 10.0.2.
Likely exposure
Exposure is limited to PAN-OS administrative web interfaces on affected versions. Exploitation requires an authenticated network-based attacker and a targeted authenticated administrator interaction. Prisma Access is stated as not affected. The source bundle also lists PAN-OS 10.1.*, but the provided description does not give a 10.1 fixed-version threshold.
Exploitation context
No active exploitation is stated in the provided sources, and the CVE is not marked KEV. The attack path depends on social engineering or otherwise inducing an authenticated administrator to click a malicious link while logged into PAN-OS.
Researcher notes
Key constraints are authentication and administrator user interaction. The highest-risk environments are those with exposed or broadly reachable management interfaces and many administrative users. Evidence for PAN-OS 10.1 applicability is incomplete in the supplied description, so confirm against Palo Alto’s advisory before scoping 10.1 remediation.
Mitigation direction
- Upgrade affected PAN-OS 8.1 systems to 8.1.20 or later.
- Upgrade affected PAN-OS 9.0 systems to 9.0.14 or later.
- Upgrade affected PAN-OS 9.1 systems to 9.1.10 or later.
- Upgrade affected PAN-OS 10.0 systems to 10.0.2 or later.
- Check Palo Alto Networks guidance for any 10.1-specific applicability.
Validation and detection
- Inventory PAN-OS versions across firewall and management assets.
- Confirm whether administrative web interfaces run affected PAN-OS versions.
- Verify upgraded systems meet or exceed the fixed versions listed.
- Review admin access logs for unusual authenticated web interface activity.
- Confirm Prisma Access is not incorrectly included in this CVE scope.
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-2021-3052 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
- 8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
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:L/UI:R/S:U/C:H/I:H/A:H2.15.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://security.paloaltonetworks.com/CVE-2021-3052CVE reference · x_refsource_MISC
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.