CVE-2011-2921: ktsuss versions 1.4 and prior has the uid set to root and does not drop privileges prior to executing user spe

Q: How do I fix CVE-2011-2921?

ktsuss: upgrade to newer than 1.4. Exact commands for each OS are on this page.

Q: Is CVE-2011-2921 being exploited?

CVE-2011-2921 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-2011-2921 affect?

CVE-2011-2921 affects ktsuss. Severity is critical (CVSS 9.8). ktsuss versions 1.4 and prior has the uid set to root and does not drop privileges prior to executing user specified commands, which can result in command execution with root privileges.

Q: How urgent is CVE-2011-2921?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2011-2921 is a critical-severity flaw (CVSS 9.8) affecting ktsuss. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ktsuss versions 1.4 and prior has the uid set to root and does not drop privileges prior to executing user specified commands, which can result in command execution with root privileges.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	83.1% (top 1%)
CISA exploited list	No
Weakness	CWE-273
Published	2019-11-19
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2019-11-19 17:15 UTCPublished CVE record published
2026-06-16 23:32 UTCUpdated Record last modified

ktsuss project ktsuss UPGRADE

Affected: <= 1.4

Fixed in: newer than 1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ktsuss

Note

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: ktsuss 1.4 - suid Privilege Escalation (Metasploit)
Metasploit: ktsuss suid Privilege Escalation

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-2011-2921?

ktsuss: upgrade to newer than 1.4. Exact commands for each OS are on this page.

Is CVE-2011-2921 being exploited?

CVE-2011-2921 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-2011-2921 affect?

CVE-2011-2921 affects ktsuss. Severity is critical (CVSS 9.8). ktsuss versions 1.4 and prior has the uid set to root and does not drop privileges prior to executing user specified commands, which can result in command execution with root privileges.

How urgent is CVE-2011-2921?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2011-2922 HIGH 7.8 UPGRADE ktsuss versions 1.4 and prior spawns the GTK interface to run as root

References

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