Security Resilience

CVE-2021-44529

RCE in Ivanti Endpoint Manager Cloud Services Appliance ≤ 4.5

CISA KEVActive ExploitationEUVD ExploitedPublic PoCRansomware-linkedRCE
Published
08 December 2021
Modified
04 August 2026
KEV Added
25 March 2024
Patch / advisory
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 0.99 99.9th 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-2021-44529 is a critical-severity Code Injection (CWE-94) vulnerability in Ivanti Endpoint Manager Cloud Services Appliance. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Junk Data (T1001.001); ranked in the top 0.1% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

A code injection vulnerability tracked as CVE-2021-44529 affects the Ivanti EPM Cloud Services Appliance (CSA). The flaw, classified under CWE-94, permits an unauthenticated remote attacker to inject and execute arbitrary code that runs with the limited privileges of the "nobody" account.

Because the attack requires no credentials and can be performed over the network with low complexity, an adversary can achieve remote code execution that may lead to confidentiality, integrity, and availability impacts on the appliance.

Public references include the Ivanti security advisory SA-2021-12-02, which addresses patches and mitigation steps, along with multiple exploit artifacts published on PacketStorm Security for CSA versions 4.5 and 4.6.

The issue received a CVSS v3.1 base score of 9.8, reflecting its critical severity and ease of remote exploitation.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

A code injection vulnerability in the Ivanti EPM Cloud Services Appliance (CSA) allows an unauthenticated user to execute arbitrary code with limited permissions (nobody).

CWE(s)
KEV Date Added
25 March 2024

Related Threats

MITRE ATT&CK Enterprise Techniques

T1001.001 Junk Data Command And Control
Adversaries may add junk data to protocols used for command and control to make detection more difficult.
T1001.003 Protocol or Service Impersonation Command And Control
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts.
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
T1003.007 Proc Filesystem Credential Access
Adversaries may gather credentials from the proc filesystem or `/proc`.
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
T1007 System Service Discovery Discovery
Adversaries may try to gather information about registered local system services.
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-4428Same vendor: Ivantiboth on KEV
CVE-2026-1281Same vendor: Ivantiboth on KEV
CVE-2026-1340Same vendor: Ivantiboth on KEV
CVE-2020-8243Same vendor: Ivantiboth on KEV
CVE-2021-22894Same vendor: Ivantiboth on KEV
CVE-2020-8218Same vendor: Ivantiboth on KEV
CVE-2024-10644Same vendor: Ivanti
CVE-2021-22900Same vendor: Ivantiboth on KEV
CVE-2019-0193Shared CWE-94both on KEV
CVE-2023-6548Shared CWE-94both on KEV

Affected Assets

ivanti
endpoint manager cloud services appliance
4.6 · ≤ 4.5

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.3.1

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-94

Makes persistent code injection into loaded programs impossible when the executable image itself resides on hardware-protected read-only media.

addresses: CWE-94

Dynamically generated code can be produced and executed inside the isolated chamber, preventing host compromise from code-injection payloads.

addresses: CWE-94

Validates inputs used in dynamic code generation to block injected directives.

addresses: CWE-94

Directly prevents execution of attacker-supplied code written into data memory regions.

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
blocks

PR.PS-06's SDLC practices directly target injection flaws via secure coding and testing (mostly), yet as a single broad outcome it leaves many code-generation specifics unaddressed (partial).

PR.DS-10 none match
blocks

PR.DS-10 protects runtime data confidentiality/integrity but has no bearing on neutralizing externally influenced input during code generation, so neither direction shows any preventive effect.

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.

removes
removes
removes
removes
removes

References