CVE-2025-65566: A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcp

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HIGH 7.5REMOTEWATCHLISTDOWNGRADE

CVE-2025-65566 is a high-severity flaw (CVSS 7.5) affecting upf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcpiface:2.1.3-dev. When the UPF receives a PFCP Session Report Response that is missing the mandatory Cause Information Element, the session report handler dereferences a nil pointer instead of rejecting the malformed message. This triggers a panic and terminates the UPF process. An attacker who can send PFCP Session Report Response message

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-476
Published	2025-12-18
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: linuxfoundation

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-18 20:16 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

linuxfoundation upf DOWNGRADE

Affected: 2.1.3 dev

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.3

1. Check installed version

apt-cache policy upf || rpm -q upf || upf --version

2. No fixed release: DOWNGRADE to a release before 2.1.3 (Debian / Ubuntu)

apt-cache madison upf sudo apt install upf=<VERSION_BEFORE_2.1.3> sudo apt-mark hold upf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list upf sudo dnf downgrade upf-<VERSION_BEFORE_2.1.3> sudo dnf versionlock add upf

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-2025-65566?

upf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-65566 being exploited?

CVE-2025-65566 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-2025-65566 affect?

CVE-2025-65566 affects upf. Severity is high (CVSS 7.5). A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcpiface:2.1.3-dev. When the UPF receives a PFCP Session Report Response that is missing the mandatory Cause Information Element, the

How urgent is CVE-2025-65566?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2025-65563 HIGH 7.5 UPGRADE A denial-of-service vulnerability exists in the omec-project UPF (component upf-epc/pfcpiface) up to at least
CVE-2025-65564 HIGH 7.5 DOWNGRADE A denial-of-service vulnerability exists in the omec-upf (upf-epc-pfcpiface) in version upf-epc-pfcpiface:2.1.
CVE-2025-65565 HIGH 7.5 DOWNGRADE A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcp
CVE-2025-65567 HIGH 7.5 DOWNGRADE A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcp
CVE-2025-65568 HIGH 7.5 DOWNGRADE A denial-of-service vulnerability exists in the omec-project UPF (pfcpiface component) in version upf-epc-pfcp

References

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