CVE Intelligence
CISA KEV Critical Authentication exploit reference

CVE-2021-44077 — Zoho ManageEngine ServiceDesk Plus Remote Code Execution Vulnerability

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.

Published Nov 29, 2021 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: mitre

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Dec 1, 2021 Detection templates (Nuclei) · 1Metasploit modules · 1Proofs of concept on GitHub · 2
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • Public exploit/PoC (nuclei, metasploit, github)+20
  • EPSS 93.3% (30-day exploitation probability)+15
  • Technical severity (critical)+10
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Dec 1, 2021
EPSS FIRST
93.3%
ahead of 100% of scored CVEs · Oct 14, 2026
Affects
Zohocorp
Manageengine Servicedesk Plus and 2 more
CVSS base
9.8
Critical · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Dec 15, 2021 — passed 1765 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Zohocorp Manageengine Servicedesk Plus, Zohocorp Manageengine Servicedesk Plus Msp, Zohocorp Manageengine Supportcenter Plus).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  4. Apply the fixed version or the patch documented under Remediation.
  5. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
  6. Search available logs for exploit probes matching the vulnerability class (authentication), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Zohocorp Manageengine Servicedesk Plus version 11.1-11138< 11.1version 11.3-11305version 11.3-11304version 11.3-11303version 11.3-11302version 11.3-11301version 11.3-11300
and 19 more version 11.2-11211version 11.2-11210version 11.2-11209version 11.2-11208version 11.2-11207version 11.2-11206version 11.2-11204version 11.2-11205version 11.1-11139version 11.1-11140version 11.1-11141version 11.1-11142version 11.1-11143version 11.1-11144version 11.1-11145version 11.2-11200version 11.2-11201version 11.2-11202version 11.2-11203
Vulnerable NIST National Vulnerability Database
Zohocorp Manageengine Servicedesk Plus Msp version 10.5-10515version 10.5-10516version 10.5-10517version 10.5-10518version 10.5-10519version 10.5-10520version 10.5-10508version 10.5-10521
and 23 more version 10.5-10522version 10.5-10523version 10.5-10524version 10.5-10525version 10.5-10526version 10.5-10527version 10.5-10528version 10.5-10529version 10.5-10513version 10.5-10514< 10.5version 10.5-10500version 10.5-10501version 10.5-10502version 10.5-10503version 10.5-10504version 10.5-10505version 10.5-10506version 10.5-10507version 10.5-10509version 10.5-10510version 10.5-10511version 10.5-10512
Vulnerable NIST National Vulnerability Database
Zohocorp Manageengine Supportcenter Plus version 11.0-11013version 11.0-11012version 11.0-11011version 11.0-11010version 11.0-11009version 11.0-11008version 11.0-11007version 11.0-11006
and 7 more version 11.0-11005version 11.0-11004version 11.0-11003version 11.0-11002version 11.0-11001version 11.0-11000< 11.0
Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 nvd@nist.gov via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical — — GitHub, Inc. via GitHub Security Advisories
9.8 CVSS 3.1 Critical — — CISA-ADP via CVE Program (cve.org) e CISA ADP
7.5 CVSS 2.0 High 10.0 6.4 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-306 · Missing Authentication for Critical Function

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Dec 1, 2021
Federal deadline
Dec 15, 2021
passed 1765 day(s) ago
Ransomware use
Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Detection templates (Nuclei)
Metasploit modules
Proofs of concept on GitHub

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 93.30%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Review authentication logs: logins without MFA, anomalous sessions and recently created accounts.
  • Hunt retroactively in logs from before Dec 1, 2021 (KEV listing): exploitation may have started earlier.
web/proxy/WAF logsnetwork IDS/IPSauthentication logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Fix documented
    Oct 13, 2026 · NIST National Vulnerability Database
  • Affected products added · zohocorp/manageengine servicedesk plus, zohocorp/manageengine servicedesk plus msp, zohocorp/manageengine supportcenter
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 9.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • 2021
  • Added to CISA KEV catalog
    Nov 30, 2021 · CISA
  • CVE published
    Nov 29, 2021 · mitre

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

Elsewhere on this site

Zohocorp
every CVE for this vendor
2021-12
what else CISA listed that month
Authentication
same class
CWE-306
other pages naming this weakness

Related CVEs (same products)

  • CVE-2022-47966 Zoho ManageEngine Multiple Products Remote Code Execution Vulnerability KEV Jan 18, 2023
  • CVE-2021-37415 Zoho ManageEngine ServiceDesk Authentication Bypass Vulnerability KEV Sep 1, 2021
  • CVE-2019-8394 Zoho ManageEngine ServiceDesk Plus (SDP) File Upload Vulnerability KEV Feb 17, 2019

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2021-44077 is "Zoho ManageEngine ServiceDesk Plus Remote Code Execution Vulnerability", rated Critical. It affects Manageengine Servicedesk Plus (Zohocorp); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 9.8 describes technical severity. EPSS 93.30% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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