CVE-2013-6410: nbd-server in Network Block Device (nbd) before 3.5 does not properly check IP addresses, which might allow re

Q: How do I fix CVE-2013-6410?

nbd: upgrade to newer than 3.4; debian linux: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2013-6410 being exploited?

CVE-2013-6410 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-2013-6410 affect?

CVE-2013-6410 affects nbd, debian linux, ubuntu linux. Severity is high (CVSS 7.5). nbd-server in Network Block Device (nbd) before 3.5 does not properly check IP addresses, which might allow remote attackers to bypass intended access restrictions via an IP address that has a partial match in the authfile configuration fil

Q: How urgent is CVE-2013-6410?

Priority 52/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2013-6410 is a high-severity flaw (CVSS 7.5) affecting nbd, debian linux, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nbd-server in Network Block Device (nbd) before 3.5 does not properly check IP addresses, which might allow remote attackers to bypass intended access restrictions via an IP address that has a partial match in the authfile configuration file.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.5% (top 15%)
CISA exploited list	No
Weakness	CWE-264
Published	2013-12-07
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: canonical · debian · wouter verhelst

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

Am I affected?

Timeline

2013-12-07 20:55 UTCPublished CVE record published
2026-06-17 00:00 UTCUpdated Record last modified

wouter verhelst nbd UPGRADE

Affected: <= 3.4 · 2.7.5 · 2.8.0 · 2.8.2 · 2.8.4 · 2.8.5 · 2.8.6 · 2.8.7

Fixed in: newer than 3.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nbd

Note

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

debian debian linux MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

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.

canonical ubuntu linux MITIGATE

Affected: 12.04 · 14.04 · 14.10 · 15.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.04

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-2013-6410?

nbd: upgrade to newer than 3.4; debian linux: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-6410 being exploited?

CVE-2013-6410 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-2013-6410 affect?

CVE-2013-6410 affects nbd, debian linux, ubuntu linux. Severity is high (CVSS 7.5). nbd-server in Network Block Device (nbd) before 3.5 does not properly check IP addresses, which might allow remote attackers to bypass intended access restrictions via an IP address that has a partial match in the authfile configuration fil

How urgent is CVE-2013-6410?

Priority 52/100. High severity; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

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References

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