How severe is CVE-2021-3287?

CVE-2021-3287 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3287 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 51% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3287?

CVE-2021-3287 primarily affects Zohocorp Manageengine Opmanager. In total, 66 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3287?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-3287 published?

CVE-2021-3287 was published on 2021-04-22 and last updated on 2026-06-17.

CVE-2021-3287

CVE-2021-3287 is a critical-severity vulnerability in Zohocorp Manageengine Opmanager with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 51% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 51% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Zohocorp Manageengine Opmanager
Published: 2021-04-22
Last modified: 2026-06-17

Description

Zoho ManageEngine OpManager before 12.5.329 allows unauthenticated Remote Code Execution due to a general bypass in the deserialization class.

Frequently asked questions

What is CVE-2021-3287?: Zoho ManageEngine OpManager before 12.5.329 allows unauthenticated Remote Code Execution due to a general bypass in the deserialization class.
How severe is CVE-2021-3287?: CVE-2021-3287 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3287 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 51% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3287?: CVE-2021-3287 primarily affects Zohocorp Manageengine Opmanager. In total, 66 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3287?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-3287 published?: CVE-2021-3287 was published on 2021-04-22 and last updated on 2026-06-17.

References

Affected products (66)

cpe:2.3:a:zohocorp:manageengine_opmanager:*:*:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:-:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125000:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125002:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125100:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125101:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125102:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125108:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125110:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125111:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125112:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125113:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125114:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125116:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125117:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125118:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125120:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125121:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125123:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125124:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125125:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125136:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125137:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125139:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125140:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125143:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125144:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125145:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125156:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125157:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125158:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125159:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125161:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125163:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125174:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125175:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125176:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125177:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125178:*:*:*:*:*:*
cpe:2.3:a:zohocorp:manageengine_opmanager:12.5:build125180:*:*:*:*:*:*

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CVE-2021-44514 — Critical (CVSS 9.8): OpUtils in Zoho ManageEngine OpManager 12.5 before 125490 mishandles authentication for a few audit directories.
CVE-2021-41075 — Critical (CVSS 9.8): The NetFlow Analyzer in Zoho ManageEngine OpManger before 125455 is vulnerable to SQL Injection in the Attacks Module…
CVE-2021-40493 — Critical (CVSS 9.8): Zoho ManageEngine OpManager before 125437 is vulnerable to SQL Injection in the support diagnostics module. This occurs…
CVE-2021-41288 — Critical (CVSS 9.8): Zoho ManageEngine OpManager version 125466 and below is vulnerable to SQL Injection in the getReportData API.
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