CVE-2013-4256: Multiple stack-based and heap-based buffer overflows in Network Audio System (NAS) 1.9.3 allow local users to

Routine

MEDIUM 4.6WATCHLISTMITIGATEDOWNGRADE

CVE-2013-4256 is a medium-severity flaw (CVSS 4.6) affecting ubuntu linux, network audio system. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple stack-based and heap-based buffer overflows in Network Audio System (NAS) 1.9.3 allow local users to cause a denial of service (crash) or possibly execute arbitrary code via the (1) display command argument to the ProcessCommandLine function in server/os/utils.c; (2) ResetHosts function in server/os/access.c; (3) open_unix_socket, (4) open_isc_local, (5) open_xsight_local, (6) open_att_local, or (7) open_att_svr4_local function in server

Why this priority

Public exploit reference
On your watchlist

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

Risk facts

CVSS score	4.6 (Medium)
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-119
Published	2013-10-09
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: canonical · radscan

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-10-09 14:54 UTCPublished CVE record published
2026-06-16 23:56 UTCUpdated Record last modified

canonical ubuntu linux MITIGATE

Affected: 12.04 · 12.10 · 13.04

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.

radscan network audio system DOWNGRADE

Affected: 1.9.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9.3

1. Check installed version

apt-cache policy network-audio-system || rpm -q network-audio-system || network-audio-system --version

2. No fixed release: DOWNGRADE to a release before 1.9.3 (Debian / Ubuntu)

apt-cache madison network-audio-system sudo apt install network-audio-system=<VERSION_BEFORE_1.9.3> sudo apt-mark hold network-audio-system

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

dnf --showduplicates list network-audio-system sudo dnf downgrade network-audio-system-<VERSION_BEFORE_1.9.3> sudo dnf versionlock add network-audio-system

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-2013-4256?

ubuntu linux: mitigate or apply the listed mitigation; network audio system: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-4256 being exploited?

CVE-2013-4256 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-2013-4256 affect?

CVE-2013-4256 affects ubuntu linux, network audio system. Severity is medium (CVSS 4.6). Multiple stack-based and heap-based buffer overflows in Network Audio System (NAS) 1.9.3 allow local users to cause a denial of service (crash) or possibly execute arbitrary code via the (1) display command argument to the ProcessCommandLin

How urgent is CVE-2013-4256?

Priority 39/100. Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities

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References

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