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CVE-2020-2050

PAN-OS: Authentication bypass vulnerability in GlobalProtect SSL VPN client certificate verification

High8.2EPSS 1.0%
Published
Updated
Reserved
Assigned by
palo_alto

Description

An authentication bypass vulnerability exists in the GlobalProtect SSL VPN component of Palo Alto Networks PAN-OS software that allows an attacker to bypass all client certificate checks with an invalid certificate. A remote attacker can successfully authenticate as any user and gain access to restricted VPN network resources when the gateway or portal is configured to rely entirely on certificate-based authentication. Impacted features that use SSL VPN with client certificate verification are: GlobalProtect Gateway, GlobalProtect Portal, GlobalProtect Clientless VPN In configurations where client certificate verification is used in conjunction with other authentication methods, the protections added by the certificate check are ignored as a result of this issue. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.17; PAN-OS 9.0 versions earlier than PAN-OS 9.0.11; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5; PAN-OS 10.0 versions earlier than PAN-OS 10.0.1.

Scores

CVSS scores of CVE-2020-2050, by who scored it
Scored byCVSSScoreVector
palo_altoCNA (assigner)3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
NVDNVD · Modified3.1High8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS (exploitation in 30 days)
1.0% · top 36% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

Affected products

  • Palo Alto Networks · PAN-OS

    • affected 8.1 – < 8.1.17
    • affected 9.0 – < 9.0.11
    • affected 9.1 – < 9.1.5
    • affected 10.0 – < 10.0.1

What to do

Solution: This issue is fixed in PAN-OS 8.1.17, PAN-OS 9.0.11, PAN-OS 9.1.5, PAN-OS 10.0.1, and all later PAN-OS versions.

Workaround: This issue can be mitigated by configuring GlobalProtect SSL VPN to require gateway and portal users to authenticate with their credentials. Other authentication methods are not impacted by this issue.

Exploitation: Palo Alto Networks is not aware of any malicious exploitation of this issue.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .