CVE-2023-38403: iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.

Q: How do I fix CVE-2023-38403?

iperf3: upgrade to 3.14; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2023-38403 being exploited?

CVE-2023-38403 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-38403 affect?

CVE-2023-38403 affects iperf3, debian linux, fedora. Severity is high (CVSS 7.5). iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.

Q: How urgent is CVE-2023-38403?

Priority 56/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2023-38403 is a high-severity flaw (CVSS 7.5) affecting iperf3, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 20%)
CISA exploited list	No
Weakness	CWE-190
Published	2023-07-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: apple · debian · es · fedoraproject · netapp

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

Am I affected?

Timeline

2023-07-17 21:15 UTCPublished CVE record published
2026-06-17 06:10 UTCUpdated Record last modified

es iperf3 UPGRADE

Affected: < 3.14

Fixed in: 3.14

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy iperf3 || rpm -q iperf3 || iperf3 --version

2. UPGRADE to 3.14 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade iperf3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade iperf3

Note

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

debian debian linux MITIGATE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 37 · 38

Fixed in: no fixed release known

Safe to downgrade to: a release before 37

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

netapp ontap select deploy administration utility MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ontap-select-deploy-administration-utility || rpm -q ontap-select-deploy-administration-utility || ontap-select-deploy-administration-utility --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

netapp clustered data ontap MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

apple macos UPGRADE

Affected: < 13.6.1 · 14.0

Fixed in: 13.6.1

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2023-38403?

iperf3: upgrade to 3.14; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-38403 being exploited?

CVE-2023-38403 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-2023-38403 affect?

CVE-2023-38403 affects iperf3, debian linux, fedora. Severity is high (CVSS 7.5). iperf3 before 3.14 allows peers to cause an integer overflow and heap corruption via a crafted length field.

How urgent is CVE-2023-38403?

Priority 56/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities · macOS vulnerabilities

Related CVEs

CVE-2024-53580 HIGH 7.5 DOWNGRADE MITIGATE iperf v3.17.1 was discovered to contain a segmentation violation via the iperf_exchange_parameters() function.
CVE-2024-26306 MEDIUM 5.9 UPGRADE MITIGATE iPerf3 before 3.17, when used with OpenSSL before 3.2.0 as a server with RSA authentication, allows a timing s
CVE-2023-7250 MEDIUM 5.3 UPGRADE MITIGATE A flaw was found in iperf, a utility for testing network performance using TCP, UDP, and SCTP

References

← Back to latest CVEs