CVE-2011-2921

CRITICALNVD 9.89.8—Weaponized

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.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 98.8%
KEV: Not listed

Published

November 19, 2019

Last Modified

November 21, 2024

Advisory Details (3)

Auto-updated Jun 3, 2026

Patch available. Sources: redhat.

generic

CVE-2011-2921

https://security-tracker.debian.org/tracker/CVE-2011-2921

redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2011-2921

generic

Packet Storm

http://packetstormsecurity.com/files/154307/ktsuss-Suid-Privilege-Escalation.html

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-273Improper Check for Dropped Privileges

Data Freshness Timeline

(refreshed 10× in last 7d / 14× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:10 UTCepss_batch
2026-06-02 20:10 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-29 13:40 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-26 07:16 UTCepss_batch
2026-05-23 03:21 UTCEG score recompute
2026-05-23 03:21 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-47344✓ verified
First seen Sep 3, 2019
ktsuss 1.4 - suid Privilege Escalation (Metasploit)
Open source ↗
Metasploitexploit/linux/local/ktsuss_suid_priv_esc✓ verified
First seen Aug 13, 2011
ktsuss suid Privilege Escalation
Open source ↗

Frequently asked(5)

What is CVE-2011-2921?

CVE-2011-2921 is a critical vulnerability published on November 19, 2019. 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.

When was CVE-2011-2921 disclosed?

CVE-2011-2921 was first published in the National Vulnerability Database on November 19, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2011-2921 actively exploited?

CVE-2011-2921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2011-2921?

CVE-2011-2921 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2011-2921?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2921, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2011-2921

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CVE-2011-2921

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

CVE-2011-2921

cve-details

Packet Storm

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2011-2921?

Published

Last Modified

Advisory Details (3)

Frequently asked(5)