Cyber Resilience

CVE-2011-2921

Ktsuss Project Ktsuss ≤ 1.4

Public PoCHigh EPSS
Published
19 November 2019
Modified
21 November 2024
CVSS Score v3.1 9.8
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.83 99.6th percentile
Risk Priority 97 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2011-2921 is a critical-severity Improper Check for Dropped Privileges (CWE-273) vulnerability in Ktsuss Project Ktsuss. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Access Token Manipulation (T1134); ranked in the top 0.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability Data

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.

CWE(s)
CWE-273

Related Threats

MITRE ATT&CK Enterprise Techniques

T1134 Access Token Manipulation Stealth
Adversaries may modify access tokens to operate under a different user or system security context to perform actions and bypass access controls.
attack.mitre.org →
T1548 Abuse Elevation Control Mechanism Privilege Escalation
Adversaries may circumvent mechanisms designed to control privilege elevation to gain higher-level permissions.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-60085Shared CWE-273
CVE-2023-34322Shared CWE-273
CVE-2026-32107Shared CWE-273
CVE-2026-44073Shared CWE-273
CVE-2025-1003Shared CWE-273
CVE-2024-8382Shared CWE-273
CVE-2023-0657Shared CWE-273
CVE-2023-52433Shared CWE-273
CVE-2026-61897Shared CWE-273
CVE-2025-27396Shared CWE-273

Affected Assets

ktsuss project
ktsuss
≤ 1.4

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC activities (code review, static analysis, testing) catch missing or incorrect privilege-drop checks, but eliminating only this one flaw covers only a fraction of the control's broader intent.

PR.AA-05 partial match
prevents

Least-privilege policy and enforcement directly motivate privilege-dropping code, yet the control does not address implementation-level verification of the drop.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect failed privilege drops, yet the control does not require such checks as part of its core intent.

A.8.18 Use of privileged utility programs partial match
degrades

Control of privileged utility programs includes ensuring privilege-dropping operations are verified before use.

A.8.2 Privileged access rights partial match
degrades

Privileged access rights policy requires verification that privilege changes succeed, directly addressing failed privilege drops.

A.8.28 Secure coding partial match
prevents

Secure coding practices can prevent missing privilege-drop checks, but the control itself does not mandate verification of privilege changes.

References