Palo Alto PAN-OS User-ID Terminal Server Agent buffer overflow

Summaryinfo

A vulnerability was found in Palo Alto PAN-OS. It has been classified as critical. Impacted is an unknown function of the component User-ID Terminal Server Agent. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-0288. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Palo Alto PAN-OS (unknown version) and classified as critical. This issue affects an unknown code block of the component User-ID Terminal Server Agent. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Multiple buffer overflow vulnerabilities in the User-ID Terminal Server Agent (TSA) component of Palo Alto Networks PAN-OS software allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic. The security risk posed by this issue is minimized when the User-ID Terminal Server Agent connectivity is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://docs.paloaltonetworks.com/ngfw/help/10-2/user-identification/device-user-identification-terminal-services-agents#:~:text=To%20minimize%20security%20risk%2C%20restrict%20TS%20Agent%20connectivity%20to%20trusted%20internal%20IP%20addresses%20only. . Panorama is not impacted by this vulnerability.

The advisory is shared at security.paloaltonetworks.com. The identification of this vulnerability is CVE-2026-0288 since 11/03/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/08/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Firewall Software

Vendor

• Palo Alto

Name

• PAN-OS

License

• commercial

Website

• Vendor: https://www.paloaltonetworks.com/

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CPE 2.2info

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Entryinfo

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