CVE-2026-0243: A denial of service (DoS) vulnerability in Palo Alto Networks Prisma SD-WAN ION devices enables an unauthentic

Routine

MEDIUM 6.5UPGRADE

CVE-2026-0243 is a medium-severity flaw (CVSS 6.5) affecting prisma sd-wan. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-606
Published	2026-05-13
Last modified	2026-10-26

Publisher (CNA): Palo Alto Networks, Inc. · Vendor: paloaltonetworks

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-13 20:16 UTCPublished CVE record published
2026-10-26 00:10 UTCUpdated Record last modified

paloaltonetworks prisma sd-wan UPGRADE

Affected: >= 6.3.1 and < 6.3.6 · >= 6.4.1 and < 6.4.3 · >= 6.5.1 and < 6.5.3 · 6.3.6 · 6.3.6 b6 · 6.3.6 b9 · 6.4.3 · 6.4.3 b6

Fixed in: 6.3.6, 6.4.3, 6.5.3

Safe to downgrade to: a release before 6.3.1

1. Check installed version

apt-cache policy prisma-sd-wan || rpm -q prisma-sd-wan || prisma-sd-wan --version

2. UPGRADE to 6.3.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade prisma-sd-wan

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade prisma-sd-wan

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.3.1 (Debian / Ubuntu)

apt-cache madison prisma-sd-wan sudo apt install prisma-sd-wan=<VERSION_BEFORE_6.3.1> sudo apt-mark hold prisma-sd-wan

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list prisma-sd-wan sudo dnf downgrade prisma-sd-wan-<VERSION_BEFORE_6.3.1> sudo dnf versionlock add prisma-sd-wan

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-0243?

prisma sd-wan: upgrade to 6.3.6, 6.4.3, 6.5.3. Exact commands for each OS are on this page.

Is CVE-2026-0243 being exploited?

CVE-2026-0243 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-0243 affect?

CVE-2026-0243 affects prisma sd-wan. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-0243?

Priority 24/100. No elevated risk signals yet.

Software pages

Palo Alto PAN-OS vulnerabilities

References

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