Paloaltonetworks: >> Pan-Os >> 11.1.7 Security Vulnerabilities
CVE-2026-0257
Authentication bypass vulnerabilities in the GlobalProtect portal and gateway of Palo Alto Networks PAN-OS® software allows the attacker to bypass security restrictions and establish an unauthorized VPN connection.
Panorama and Cloud NGFW are not impacted by these issues.
Known exploited
CVSS Score
7.8
EPSS Score
0.478
Published
2026-05-13
CVE-2026-0300
A buffer overflow vulnerability in the User-ID™ Authentication Portal (aka Captive Portal) service of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
The risk of this issue is greatly reduced if you secure access to the User-ID™ Authentication Portal per the best practice guidelines https://knowledgebase.paloaltonetworks.com/KCSArticleDetail by restricting access to only trusted internal IP addresses.
Prisma Access, Cloud NGFW and Panorama appliances are not impacted by this vulnerability.
Known exploited
CVSS Score
9.3
EPSS Score
0.045
Published
2026-05-06
A vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to cause a denial of service (DoS) to the firewall. Repeated attempts to trigger this issue results in the firewall entering into maintenance mode.
CVSS Score
6.6
EPSS Score
0.001
Published
2026-01-15
An improper input neutralization vulnerability in the management web interface of the Palo Alto Networks PAN-OS® software enables an authenticated administrator to bypass system restrictions and execute arbitrary commands.
The security risk posed by this issue is significantly minimized when CLI access is restricted to a limited group of administrators.
Cloud NGFW and Prisma® Access are not affected by this vulnerability.
CVSS Score
5.5
EPSS Score
0.001
Published
2025-10-09
A missing exception check in Palo Alto Networks PAN-OS® software with the web proxy feature enabled allows an unauthenticated attacker to send a burst of maliciously crafted packets that causes the firewall to become unresponsive and eventually reboot. Repeated successful attempts to trigger this condition will cause the firewall to enter maintenance mode.
This issue does not affect Cloud NGFW or Prisma Access.
CVSS Score
8.2
EPSS Score
0.003
Published
2025-05-14
CVE-2024-3393
A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.
Known exploited
CVSS Score
8.7
EPSS Score
0.797
Published
2024-12-27
When SSL/TLS Forward Proxy Decryption mode has been configured to decrypt the web transactions, the PAN-OS URL filtering feature inspects the HTTP Host and URL path headers for policy enforcement on the decrypted HTTPS web transactions but does not consider Server Name Indication (SNI) field within the TLS Client Hello handshake. This allows a compromised host in a protected network to evade any security policy that uses URL filtering on a firewall configured with SSL Decryption in the Forward Proxy mode. A malicious actor can then use this technique to evade detection of communication on the TLS handshake phase between a compromised host and a remote malicious server. This technique does not increase the risk of a host being compromised in the network. It does not impact the confidentiality or availability of a firewall. This is considered to have a low impact on the integrity of the firewall because the firewall fails to enforce a policy on certain traffic that should have been blocked. This issue does not impact the URL filtering policy enforcement on clear text or encrypted web transactions. This technique can be used only after a malicious actor has compromised a host in the protected network and the TLS/SSL Decryption feature is enabled for the traffic that the attacker controls. Palo Alto Networks is not aware of any malware that uses this technique to exfiltrate data. This issue is applicable to all current versions of PAN-OS. This issue does not impact Panorama or WF-500 appliances.
CVSS Score
3.0
EPSS Score
0.003
Published
2020-08-12