CVE-2021-42099

Zoho ManageEngine M365 Manager Plus before 4421 is vulnerable to file-upload remote code execution.

Published: 2021-11-30 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-42099 is rated High Risk (66.7/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.55%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-42099

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 22.41% 6.55% -15.87%
2 2025-05-09 27.75% 22.41% -5.33%
3 2025-04-02 — 27.75% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-42099

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2021-42099

Affected software / configurations for CVE-2021-42099

Vendor Product Version Raw CPE
zohocorp manageengine_m365_manager_plus — cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:-:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4000 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4000:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4001 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4001:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4002 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4002:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4003 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4003:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4004 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4004:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4005 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4005:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4007 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4007:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4008 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4008:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4009 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4009:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4010 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4010:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4011 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4011:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4012 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4012:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4013 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4013:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4014 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4014:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4100 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4100:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4101 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4101:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4102 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4102:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4103 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4103:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4104 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4104:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4105 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4105:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4106 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4106:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4108 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4108:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4109 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4109:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4110 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4110:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4111 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4111:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4112 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4112:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4113 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4113:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4115 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4115:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4116 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4116:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4117 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4117:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4118 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4118:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4119 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4119:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4200 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4200:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4201 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4201:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4202 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4202:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4203 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4203:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4204 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4204:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4205 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4205:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4206 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4206:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4207 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4207:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4208 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4208:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4209 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4209:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4210 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4210:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4211 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4211:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4212 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4212:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4213 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4213:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4214 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4214:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4215 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4215:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4216 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4216:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4217 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4217:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4218 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4218:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4219 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4219:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4220 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4220:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4221 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4221:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4222 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4222:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4300 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4300:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4301 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4301:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4302 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4302:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4303 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4303:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4304 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4304:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4305 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4305:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4306 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4306:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4308 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4308:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4309 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4309:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4310 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4310:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4311 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4311:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4312 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4312:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4316 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4316:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4317 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4317:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4318 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4318:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4319 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4319:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4320 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4320:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4321 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4321:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4322 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4322:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4324 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4324:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4325 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4325:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4327 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4327:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4328 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4328:*:*:*:*:*:*:*
zohocorp manageengine_m365_manager_plus build_4329 cpe:2.3:a:zohocorp:manageengine_m365_manager_plus:build_4329:*:*:*:*:*:*:*

References for CVE-2021-42099

cvelogic Threat Intelligence