PAN-OS: Spoofed Kerberos key distribution center authentication bypass

Published 6 y ago 2020-05-13 · modified 4 mo ago 2026-06-17 · JSON

CVSS

8.1

v3.1 · CNA

CISA KEV

not known exploited

EPSS

1.3%

percentile 71%

Public exploits

none known

An authentication bypass by spoofing vulnerability exists in the authentication daemon and User-ID components of Palo Alto Networks PAN-OS by failing to verify the integrity of the Kerberos key distribution center (KDC) before authenticating users. This affects all forms of authentication that use a Kerberos authentication profile. A man-in-the-middle type of attacker with the ability to intercept communication between PAN-OS and KDC can login to PAN-OS as an administrator. This issue affects: PAN-OS 7.1 versions earlier than 7.1.26; PAN-OS 8.1 versions earlier than 8.1.13; PAN-OS 9.0 versions earlier than 9.0.6; All version of PAN-OS 8.0.

Exploit prediction (EPSS)

1.33% probability of exploitation in the next 30 days, higher than 71% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CNA	3.1	8.1	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
CNA	3.1	8.1	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD	3.1	8.1	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`
NVD	2.0	6.8	`AV:N/AC:M/Au:N/C:P/I:P/A:P`

Affected products

Palo Alto Networks PAN-OS

Classification

Weakness

CWE-290 Authentication Bypass by Spoofing

Technology feeds

Palo Alto PAN-OS (RSS, critical only)

References

security.paloaltonetworks.com /CVE-2020-2002 · x_refsource_MISC, x_transferred

Sources

CVE List: CVE-2020-2002
NVD: CVE-2020-2002

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.