Security readout for executives and security teams
Plain-English summary
This flaw affects a narrow but high-value firewall configuration: Palo Alto Networks PA-7000 Series devices with a Log Forwarding Card, running affected PAN-OS 9.0 or 9.1 versions, with WildFire enabled. A remote attacker could crash a daemon or potentially run code as root.
Executive priority
Treat this as high priority for affected PA-7000 firewall estates because impact includes denial of service and potential root-level code execution. The narrow configuration requirement should make scoping fast.
Technical view
CVE-2020-1992 is a CWE-134 format string vulnerability in the PAN-OS Varrcvr daemon. It affects PAN-OS 9.0 before 9.0.7 and 9.1 before 9.1.2 on PA-7000 devices with an installed and configured LFC. WildFire services must be configured and enabled.
Likely exposure
Exposure is limited to PA-7000 Series firewalls with an LFC installed and configured, affected PAN-OS 9.0 or 9.1 versions, and WildFire enabled. PAN-OS 8.1 and earlier and other PA Series firewalls are stated as unaffected.
Exploitation context
The source bundle does not report active exploitation, and the KEV flag is false. The CVSS vector is network-accessible with no privileges or user interaction, but attack complexity is high.
Researcher notes
Focus validation on the conjunction of model, LFC state, PAN-OS branch, and WildFire enablement. Avoid broad assumptions: the provided advisory states other PA Series firewalls and PAN-OS 8.1 and earlier are not affected.
Mitigation direction
- Upgrade PAN-OS 9.0 deployments to 9.0.7 or later.
- Upgrade PAN-OS 9.1 deployments to 9.1.2 or later.
- Prioritize PA-7000 devices with LFC and WildFire enabled.
- Check Palo Alto Networks guidance before changing WildFire or LFC configuration.
Validation and detection
- Inventory PA-7000 Series devices separately from other firewall models.
- Confirm whether an LFC is installed and configured.
- Check PAN-OS version against 9.0.7 and 9.1.2 fixed thresholds.
- Confirm whether WildFire services are configured and enabled.
- Review device logs for unexpected Varrcvr daemon crashes.
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
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ATT&CK lookup starting points
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CWE-134: Exact CWE lookup
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Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-1992 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://security.paloaltonetworks.com/CVE-2020-1992CVE 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.