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TI-2021-02191 Aliases CVE-2021-3053GHSA-34w2-p277-pp7p

PAN-OS: Exceptional Condition Denial-of-Service (DoS)

Priority LOW 35CWE-755Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

An improper handling of exceptional conditions vulnerability exists in the Palo Alto Networks PAN-OS dataplane that enables an unauthenticated network-based attacker to send specifically crafted traffic through the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.5. This issue does not affect Prisma Access.

Why it matters now

EPSS 0.01008 63rd percentileScored 2026-11-07
Fix Fixed PAN-OS (Palo Alto Networks): 8.1.20, 9.0.14, 9.1.9 +1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
Palo Alto NetworksPAN-OS8.1 to before 8.1.20; 9.0 to before 9.0.14; 9.1 to before 9.1.9; 10.0 to before 10.0.58.1.20, 9.0.14, 9.1.9, 10.0.5Patch availableCNA
  • PAN-OS VendorPalo Alto Networks Affected 8.1 to before 8.1.20; 9.0 to before 9.0.14; 9.1 to before 9.1.9; 10.0 to before 10.0.5 Fixed in 8.1.20, 9.0.14, 9.1.9, 10.0.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*8.1.0 to before 8.1.20; 9.0.0 to before 9.0.14; 9.1.0 to before 9.1.9; 10.0.0 to before 10.0.5VulnerableCyberArk Software, a Palo Alto Networks Company

Remediation

  • Fix · CNA PAN-OS (Palo Alto Networks) Fixed in 8.1.20, 9.0.14, 9.1.9, 10.0.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3053
  2. 2026-10-03 Alias added: GHSA-34w2-p277-pp7p

References

Advisory 1

  • TI-2024-08782 Expedition: Unauthenticated OS Command Injection Vulnerability Leads to Firewall Credential Disclosure KEVCVSS 4.0CRITICAL 9.9
  • TI-2024-03172 PAN-OS: Arbitrary File Creation Leads to OS Command Injection Vulnerability in GlobalProtect KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01936 PAN-OS: Authentication Bypass in SAML Authentication KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-11675 Palo Alto Networks PAN-OS before 6.1.19, 7.0.x before 7.0.19, 7.1.x before 7.1.14, and… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-00239 PAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication Portal KEVCVSS 4.0CRITICAL 9.3
  • TI-2024-08784 Expedition: SQL Injection Leads to Firewall Admin Credential Disclosure KEVCVSS 4.0CRITICAL 9.2
See all 367 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences