How severe is CVE-2021-44077?

CVE-2021-44077 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-44077?

Affected package information for CVE-2021-44077 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-44077?

No fixed version has been published for CVE-2021-44077 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-44077 actively exploited in the wild?

Yes. There are 6 known exploit references for CVE-2021-44077, including 5 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2021-44077?

CVE-2021-44077 has an EPSS (Exploit Prediction Scoring System) score of 94.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2021-44077 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-44077 (Zoho ManageEngine ServiceDesk Plus Remote Code Execution Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-12-01. CISA required all US federal civilian agencies to remediate this vulnerability by 2021-12-15. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2021-44077?

CVE-2021-44077 is classified as Missing Authentication (CWE-306). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2021-44077?

CVE-2021-44077 affects zohocorp manageengine servicedesk plus (3 versions, e.g. 11.1, 11.2, 11.3); zohocorp manageengine servicedesk plus msp (1 version, e.g. 10.5); zohocorp manageengine supportcenter plus (1 version, e.g. 11.0). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2021-44077?

A Nuclei detection template exists for CVE-2021-44077, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2021-44077 published, and has it been updated?

CVE-2021-44077 was published on November 29, 2021 and was last updated on October 31, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-12-01 — agencies required to remediate by 2021-12-15

CVE-2021-44077

CRITICAL

Zoho ManageEngine ServiceDesk Plus before 11306, ServiceDesk Plus MSP before 10530, and SupportCenter Plus before 11014 are vulnerable to unauthenticated remote code execution. This…

Published

Nov 29, 2021

Updated

Oct 31, 2025

Affected

0 pkgs

Patched

None yet

Exploits

6 known

EPSS Exploitation Probability

via FIRST.org ↗

94.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

Zoho ManageEngine ServiceDesk Plus before 11306, ServiceDesk Plus MSP before 10530, and SupportCenter Plus before 11014 are vulnerable to unauthenticated remote code execution. This is related to /RestAPI URLs in a servlet, and ImportTechnicians in the Struts configuration.

Affected Products

3 products · 73 configurations

Application

manageengine servicedesk pluszohocorp

< 11.1

3 versions

11.111.211.3

Application

manageengine servicedesk plus mspzohocorp

< 10.5

1 version

10.5

Application

manageengine supportcenter pluszohocorp

< 11.0

1 version

11.0

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.