PAN-OS: Firewall Denial-of-Service (DoS) in the Web-Proxy Feature via a Burst of Maliciously Crafted Packets
- Severity
- High7.5CVSS 3.1, High
- EPSS
- 0.42%
- Published
- 14 May 2025
- Updated
- 17 Jun 2026
Description
Title, description and vendor guidance are quoted from the source records.
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.
Weakness: CWE-754
Known exploited
Not listed in CISA KEV as of the last check.
Exploit prediction
0.42% probability of exploitation in the next 30 days (percentile 34%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
What the source states, per branch
Versions matched by Patcharo
Palo Alto Networks PAN-OSSource: Palo Alto Networks (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 11.2 | >= 11.2.0, < 11.2.5 | 11.2.5 |
| 11.1 | >= 11.1.0, < 11.1.6-h1 >= 11.1.7, < 11.1.7-h2 | 11.1.6-h1 11.1.7-h2 |
Versions not listed are stated unaffected by the vendor.
Workaround / Vendor remediation
Workaround · PAN-OS
If you are not using the web proxy feature, you can disable it to mitigate this issue. For more information regarding the web proxy feature, see our documentation regarding the web proxy feature https://docs.paloaltonetworks.com/pan-os/11-0/pan-os-new-features/networking-features/web-proxyhttps:// .
Vendor remediation · PAN-OS
Version Minor Version Suggested Solution PAN-OS 11.2 11.2.0 through 11.2.4Upgrade to 11.2.5 or later. PAN-OS 11.111.1.0 through 11.1.7 Upgrade to 11.1.7-h2 or 11.1.8 or later. 11.1.0 through 11.1.6Upgrade to 11.1.6-h1 or 11.1.8 or later.PAN-OS 11.0 (EoL) Upgrade to a supported fixed version. PAN-OS 10.2 No action needed.PAN-OS 10.1 No action needed.All other unsupported PAN-OS versions Upgrade to a supported fixed version.
References
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Palo Alto Networks (CVE record)
- Palo Alto Networks (CVE record) · 27 Sept 2026, 23:46 UTC · Parser patcharo-cve5/1.1.0
- NVD
- NVD · 27 Sept 2026, 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 27 Sept 2026, 23:46 UTC · Parser patcharo-epss/1.0.0
Last verified: 28 Sept 2026, 02:31 UTC