CVE-2021-3056

highpriority · track · 36EPSS 0.015 · 75 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.54% (75th) EPSS

CVSS 8.5 · high

Is it mine?

13 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

A memory corruption vulnerability in Palo Alto Networks PAN-OS GlobalProtect Clientless VPN enables an authenticated attacker to execute arbitrary code with root user privileges during SAML authentication. 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 10.0.1. Prisma Access customers with Prisma Access 2.1 Preferred firewalls are impacted by this issue.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.08.5highAV:N/AC:M/Au:S/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 6.8 · impact 10

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.8highAV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@paloaltonetworks.comexploitability 2.8 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-120USCWE-120USCWE-787US

affected products (13)

Products and version ranges known to be affected.

Palo Alto Networks PAN-OS10.0 → 10.0.1enisa_euvdEU
Palo Alto Networks PAN-OS8.1 → 8.1.20enisa_euvdEU
Palo Alto Networks PAN-OS9.0 → 9.0.14enisa_euvdEU
Palo Alto Networks PAN-OS9.1 → 9.1.9enisa_euvdEU
Palo Alto Networks Prisma Access≤ 2.1 Preferredenisa_euvdEU
Palo Alto Networks Inc. PAN-OS10.0.0 → 10.0.1fstec_bduRU
Palo Alto Networks Inc. PAN-OS8.1 → 8.1.20fstec_bduRU
Palo Alto Networks Inc. PAN-OS9.0 → 9.0.14fstec_bduRU
Palo Alto Networks Inc. PAN-OS9.1 → 9.1.9fstec_bduRU
paloaltonetworks pan-os= 10.0.0nvdUScpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os8.1.0 → 8.1.20nvdUScpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os9.0.0 → 9.0.14nvdUScpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os9.1.0 → 9.1.9nvdUScpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2021-11-10modified 2026-06-17

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+16120 more

references (7)

External citations — patches, advisories, analysis.

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