CVE-2021-3047

Name: CVE-2021-3047
Creator: NVD / NIST
Published: 2021-08-11T17:15:07.523+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.1/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2021-3047 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. 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. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.1/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.45%

36.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Paloaltonetworks	Pan-Os	>= 8.1.0, < 8.1.19
Paloaltonetworks	Pan-Os	>= 9.0.0, < 9.0.14
Paloaltonetworks	Pan-Os	>= 9.1.0, < 9.1.10
Paloaltonetworks	Pan-Os	>= 10.0.0, < 10.0.4

References

https://security.paloaltonetworks.com/CVE-2021-3047Vendor Advisory
https://security.paloaltonetworks.com/CVE-2021-3047Vendor Advisory

Timeline

Published: Aug 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3047?

How severe is CVE-2021-3047?

CVE-2021-3047 has a CVSS score of 3.1/10 (LOW severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3047?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3047?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST