CVE-2021-3047

PAN-OS: Weak Cryptography Used in Web Interface Authentication

LOW
3.1
CVSS Score
Published: August 11, 2021 at 05:10 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorPAN-OS

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Severity
LOW3.1
Exploit prediction
EPSS 0.5%

Description

A cryptographically weak pseudo-random number generator (PRNG) is used during authentication to the Palo Alto Networks PAN-OS web interface. This enables an authenticated attacker, with the capability to observe their own authentication secrets over a long duration on the PAN-OS appliance, to impersonate another authenticated web interface administrator's session. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.19; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.10; PAN-OS 10.0 versions earlier than PAN-OS 10.0.4. PAN-OS 10.1 versions are not impacted.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

10.0 ≤ v < 10.0.410.0.0 ≤ v < 10.0.48.1 ≤ v < 8.1.198.1.0 ≤ v < 8.1.199.0 ≤ v < 9.0.149.0.0 ≤ v < 9.0.149.1 ≤ v < 9.1.109.1.0 ≤ v < 9.1.1010.08.19.09.1
Affected range stops below 10.0.4, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 10.1.* (unaffected)
Affected range stops below 8.1.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.1.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-338

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