CVE-2013-2776: sudo 1.3.5 through 1.7.10p5 and 1.8.0 through 1.8.6p6, when running on systems without /proc or the sysctl fun

Q: How do I fix CVE-2013-2776?

sudo: mitigate or apply the listed mitigation; mac os x: upgrade to newer than 10.10.4. Exact commands for each OS are on this page.

Q: Is CVE-2013-2776 being exploited?

CVE-2013-2776 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-2013-2776 affect?

CVE-2013-2776 affects sudo, mac os x. Severity is medium (CVSS 4.4). sudo 1.3.5 through 1.7.10p5 and 1.8.0 through 1.8.6p6, when running on systems without /proc or the sysctl function with the tty_tickets option enabled, does not properly validate the controlling terminal device, which allows local users wi

Q: How urgent is CVE-2013-2776?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 4.4MITIGATEUPGRADE

CVE-2013-2776 is a medium-severity flaw (CVSS 4.4) affecting sudo, mac os x. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

sudo 1.3.5 through 1.7.10p5 and 1.8.0 through 1.8.6p6, when running on systems without /proc or the sysctl function with the tty_tickets option enabled, does not properly validate the controlling terminal device, which allows local users with sudo permissions to hijack the authorization of another terminal via vectors related to connecting to the standard input, output, and error file descriptors of another terminal. NOTE: this is one of three c

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-264
Published	2013-04-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: apple · todd miller

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

Am I affected?

Timeline

2013-04-08 17:55 UTCPublished CVE record published
2026-06-16 23:53 UTCUpdated Record last modified

todd miller sudo MITIGATE

Affected: 1.3.5 · 1.6 · 1.6.1 · 1.6.2 · 1.6.2p3 · 1.6.3 · 1.6.3_p7 · 1.6.4

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

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

Downgrade not recommended

This is a core system component: downgrading can break the OS. Apply the distro update or the vendor mitigation.

apple mac os x UPGRADE

Affected: <= 10.10.4

Fixed in: newer than 10.10.4

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-2013-2776?

sudo: mitigate or apply the listed mitigation; mac os x: upgrade to newer than 10.10.4. Exact commands for each OS are on this page.

Is CVE-2013-2776 being exploited?

CVE-2013-2776 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-2013-2776 affect?

CVE-2013-2776 affects sudo, mac os x. Severity is medium (CVSS 4.4). sudo 1.3.5 through 1.7.10p5 and 1.8.0 through 1.8.6p6, when running on systems without /proc or the sysctl function with the tty_tickets option enabled, does not properly validate the controlling terminal device, which allows local users wi

How urgent is CVE-2013-2776?

Priority 23/100. No elevated risk signals yet.

Software pages

Sudo vulnerabilities

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References

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