CVE-2012-0862: builtins.c in Xinetd before 2.3.15 does not check the service type when the tcpmux-server service is enabled,

Q: How do I fix CVE-2012-0862?

xinetd: upgrade to newer than 2.3.14. Exact commands for each OS are on this page.

Q: Is CVE-2012-0862 being exploited?

CVE-2012-0862 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-2012-0862 affect?

CVE-2012-0862 affects xinetd. Severity is medium (CVSS 4.3). builtins.c in Xinetd before 2.3.15 does not check the service type when the tcpmux-server service is enabled, which exposes all enabled services and allows remote attackers to bypass intended access restrictions via a request to tcpmux port

Q: How urgent is CVE-2012-0862?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2012-0862 is a medium-severity flaw (CVSS 4.3) affecting xinetd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

builtins.c in Xinetd before 2.3.15 does not check the service type when the tcpmux-server service is enabled, which exposes all enabled services and allows remote attackers to bypass intended access restrictions via a request to tcpmux port 1.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-20
Published	2012-06-04
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2012-06-04 20:55 UTCPublished CVE record published
2026-06-16 23:38 UTCUpdated Record last modified

xinetd xinetd UPGRADE

Affected: <= 2.3.14 · 2.3.5 · 2.3.6 · 2.3.7 · 2.3.8 · 2.3.9 · 2.3.10 · 2.3.11

Fixed in: newer than 2.3.14

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.3.14 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade xinetd

Note

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

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-2012-0862?

xinetd: upgrade to newer than 2.3.14. Exact commands for each OS are on this page.

Is CVE-2012-0862 being exploited?

CVE-2012-0862 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-2012-0862 affect?

CVE-2012-0862 affects xinetd. Severity is medium (CVSS 4.3). builtins.c in Xinetd before 2.3.15 does not check the service type when the tcpmux-server service is enabled, which exposes all enabled services and allows remote attackers to bypass intended access restrictions via a request to tcpmux port

How urgent is CVE-2012-0862?

Priority 37/100. No elevated risk signals yet.

Related CVEs

CVE-2013-4342 HIGH 7.6 MITIGATE MITIGATE xinetd does not enforce the user and group configuration directives for TCPMUX services, which causes these se

References

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