CVE-2013-7441: The modern style negotiation in Network Block Device (nbd-server) 2.9.22 through 3.3 allows remote attackers t

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HIGH 7.8DOWNGRADE

CVE-2013-7441 is a high-severity flaw (CVSS 7.8) affecting nbd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The modern style negotiation in Network Block Device (nbd-server) 2.9.22 through 3.3 allows remote attackers to cause a denial of service (root process termination) by (1) closing the connection during negotiation or (2) specifying a name for a non-existent export.

Why this priority

High severity

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

Risk facts

CVSS score	7.8 (High)
EPSS exploit chance	3.7% (top 10%)
CISA exploited list	No
Weakness	CWE-399
Published	2015-05-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wouter verhelst

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

Am I affected?

Timeline

2015-05-29 15:59 UTCPublished CVE record published
2026-06-17 00:01 UTCUpdated Record last modified

wouter verhelst nbd DOWNGRADE

Affected: 2.9.3 · 2.9.4 · 2.9.5 · 2.9.6 · 2.9.7 · 2.9.8 · 2.9.9 · 2.9.22

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.9.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.9.3 (Debian / Ubuntu)

apt-cache madison nbd sudo apt install nbd=<VERSION_BEFORE_2.9.3> sudo apt-mark hold nbd

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

dnf --showduplicates list nbd sudo dnf downgrade nbd-<VERSION_BEFORE_2.9.3> sudo dnf versionlock add nbd

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-2013-7441?

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

Is CVE-2013-7441 being exploited?

CVE-2013-7441 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-2013-7441 affect?

CVE-2013-7441 affects nbd. Severity is high (CVSS 7.8). The modern style negotiation in Network Block Device (nbd-server) 2.9.22 through 3.3 allows remote attackers to cause a denial of service (root process termination) by (1) closing the connection during negotiation or (2) specifying a name f

How urgent is CVE-2013-7441?

Priority 50/100. High severity

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References

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