CVE-2023-47346: Buffer Overflow vulnerability in free5gc 3.3.0, UPF 1.2.0, and SMF 1.2.0 allows attackers to cause a denial of

This week

HIGH 7.5REMOTEDOWNGRADEDOWNGRADEDOWNGRADE

CVE-2023-47346 is a high-severity flaw (CVSS 7.5) affecting free5gc, smf, upf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Overflow vulnerability in free5gc 3.3.0, UPF 1.2.0, and SMF 1.2.0 allows attackers to cause a denial of service via crafted PFCP messages.

Why this priority

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

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	0.8% (top 44%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-11-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: free5gc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-11-13 22:15 UTCPublished CVE record published
2026-06-17 06:32 UTCUpdated Record last modified

free5gc free5gc DOWNGRADE

Affected: 3.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.3.0

1. Check installed version

apt-cache policy free5gc || rpm -q free5gc || free5gc --version

2. No fixed release: DOWNGRADE to a release before 3.3.0 (Debian / Ubuntu)

apt-cache madison free5gc sudo apt install free5gc=<VERSION_BEFORE_3.3.0> sudo apt-mark hold free5gc

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

dnf --showduplicates list free5gc sudo dnf downgrade free5gc-<VERSION_BEFORE_3.3.0> sudo dnf versionlock add free5gc

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.

free5gc smf DOWNGRADE

Affected: 1.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison smf sudo apt install smf=<VERSION_BEFORE_1.2.0> sudo apt-mark hold smf

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

dnf --showduplicates list smf sudo dnf downgrade smf-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add smf

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.

free5gc upf DOWNGRADE

Affected: 1.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison upf sudo apt install upf=<VERSION_BEFORE_1.2.0> sudo apt-mark hold upf

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

dnf --showduplicates list upf sudo dnf downgrade upf-<VERSION_BEFORE_1.2.0> 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-2023-47346?

free5gc: downgrade or apply the listed mitigation; smf: downgrade or apply the listed mitigation; upf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-47346 being exploited?

CVE-2023-47346 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-2023-47346 affect?

CVE-2023-47346 affects free5gc, smf, upf. Severity is high (CVSS 7.5). Buffer Overflow vulnerability in free5gc 3.3.0, UPF 1.2.0, and SMF 1.2.0 allows attackers to cause a denial of service via crafted PFCP messages.

How urgent is CVE-2023-47346?

Priority 50/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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