CVE-2021-3047

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.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2021-3047 on 2026-06-05. Shown when MITRE's text differs from the cvelistV5 mirror.

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.

Overview

State

—

Assigner (CNA)

—

CVSS severity

MEDIUM

CVSS score

5.0 / 10

CVSS vector

AV:N/AC:M/Au:S/C:N/I:P/A:N

Effective score

5.0 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

2021-08-11 00:00 UTC

Last updated

—

Source

https://www.rapid7.com/db/vulnerabilities/panos-cve-2021-3047/

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2021-08-11 17:15:07 UTC

NVD last modified

2024-11-21 06:20:50 UTC

NVD CVSS v3.1

4.2 / 10 MEDIUM source: psirt@paloaltonetworks.com

NVD CVSS vector

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

Exploitability subscore

1.6 / 10

Impact subscore

2.5 / 10

EPSS score

0.0028 (probability of exploitation in next 30 days)

EPSS percentile

51.98% vs all CVEs — higher = more likely to be exploited, as of 2026-06-04

NVD-assigned CWE(s): CWE-338 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2021-26399

Assigner

palo_alto

Published

Aug 11, 2021, 5:10:17 PM

Updated

Sep 17, 2024, 2:32:37 AM

EUVD base score (CVSS 3.1)

4.2 / 10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

EUVD-reported EPSS

0.2800

Vendors

Palo Alto Networks

Products

PAN-OS (9.0 <9.0.14)

PAN-OS (8.1 <8.1.19)

PAN-OS (10.0 <10.0.4)

PAN-OS (9.1 <9.1.10)

Aliases

GHSA-jgpx-vx43-89ff

ENISA 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.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• https://attackerkb.com/topics/CVE-2021-3047 rapid7:attackerkb.com
• https://security.paloaltonetworks.com/CVE-2021-3047 rapid7:security.paloaltonetworks.com
• https://www.cve.org/CVERecord?id=CVE-2021-3047 rapid7:www.cve.org

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• What To Do If You Can't Patch A Software Vulnerability - Forbes
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• Oracle Critical Patch Update Advisory - April 2026
  web:www.oracle.com

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  2026-06-04 02:02 UTC
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  web:www.oracle.com

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